Fixed typos

- Removed duplicate words, like "the the" and "to to"
- Removed duplicate lines (one double sort line found in mysql.cc)
- Fixed some typos found while searching for duplicate words.

Command used to find duplicate words:
egrep -rI "\s([a-zA-Z]+)\s+\1\s" | grep -v param

Thanks to Artjoms Rimdjonoks for the command and pointing out the
spelling errors.

Author: montywi

mysql-test/main/mysqld--help.result

@@ -1495,9 +1495,8 @@ The following specify which files/extra groups are read (specified before remain
  --thread-pool-priority=name 
  Threadpool priority. High priority connections usually
  start executing earlier than low priority.If priority set
- to 'auto', the the actual priority(low or high) is
- determined based on whether or not connection is inside
- transaction.
+ to 'auto', the actual priority(low or high) is determined
+ based on whether or not connection is inside transaction.
  --thread-pool-size=# 
  Number of thread groups in the pool. This parameter is
  roughly equivalent to maximum number of concurrently

mysql-test/suite/sys_vars/r/sysvars_server_embedded.result

@@ -1015,7 +1015,7 @@ COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	FOREIGN_KEY_CHECKS
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	BOOLEAN
-VARIABLE_COMMENT	If set to 1 (the default) foreign key constraints (including ON UPDATE and ON DELETE behavior) InnoDB tables are checked, while if set to 0, they are not checked. 0 is not recommended for normal use, though it can be useful in situations where you know the data is consistent, but want to reload data in a different order from that that specified by parent/child relationships. Setting this variable to 1 does not retrospectively check for inconsistencies introduced while set to 0.
+VARIABLE_COMMENT	If set to 1 (the default) foreign key constraints (including ON UPDATE and ON DELETE behavior) InnoDB tables are checked, while if set to 0, they are not checked. 0 is not recommended for normal use, though it can be useful in situations where you know the data is consistent, but want to reload data in a different order from that specified by parent/child relationships. Setting this variable to 1 does not retrospectively check for inconsistencies introduced while set to 0.
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -1045,7 +1045,7 @@ COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	FOREIGN_KEY_CHECKS
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	BOOLEAN
-VARIABLE_COMMENT	If set to 1 (the default) foreign key constraints (including ON UPDATE and ON DELETE behavior) InnoDB tables are checked, while if set to 0, they are not checked. 0 is not recommended for normal use, though it can be useful in situations where you know the data is consistent, but want to reload data in a different order from that that specified by parent/child relationships. Setting this variable to 1 does not retrospectively check for inconsistencies introduced while set to 0.
+VARIABLE_COMMENT	If set to 1 (the default) foreign key constraints (including ON UPDATE and ON DELETE behavior) InnoDB tables are checked, while if set to 0, they are not checked. 0 is not recommended for normal use, though it can be useful in situations where you know the data is consistent, but want to reload data in a different order from that specified by parent/child relationships. Setting this variable to 1 does not retrospectively check for inconsistencies introduced while set to 0.
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
@@ -4505,7 +4505,7 @@ COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	THREAD_POOL_PRIORITY
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	ENUM
-VARIABLE_COMMENT	Threadpool priority. High priority connections usually start executing earlier than low priority.If priority set to 'auto', the the actual priority(low or high) is determined based on whether or not connection is inside transaction.
+VARIABLE_COMMENT	Threadpool priority. High priority connections usually start executing earlier than low priority.If priority set to 'auto', the actual priority(low or high) is determined based on whether or not connection is inside transaction.
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

sql/ddl_log.cc

@@ -2029,7 +2029,7 @@ static int ddl_log_execute_action(THD *thd, MEM_ROOT *mem_root,
       {
         LEX_CUSTRING version= {ddl_log_entry->uuid, MY_UUID_SIZE};
         /*
-          Temporary .frm file exists.  This means that that the table in
+          Temporary .frm file exists.  This means that the table in
           the storage engine can be of either old or new version.
           If old version, delete the new .frm table and keep the old one.
           If new version, replace the old .frm with the new one.

sql/debug_sync.cc

@@ -74,7 +74,7 @@ struct st_debug_sync_control
 
 /**
   Definitions for the debug sync facility.
-  1. Global string variable to hold a set of of "signals".
+  1. Global string variable to hold a set of "signals".
   2. Global condition variable for signaling and waiting.
   3. Global mutex to synchronize access to the above.
 */
@@ -1009,7 +1009,7 @@ static bool debug_sync_set_action(THD *thd, st_debug_sync_action *action)
     If the terminator of the token is ASCII NUL ('\0'), it returns a
     pointer to the terminator (string end).
 
-    If the terminator is a space character, it replaces the the first
+    If the terminator is a space character, it replaces the first
     byte of the terminator character by ASCII NUL ('\0'), skips the (now
     corrupted) terminator character, and skips all following space
     characters. It returns a pointer to the next non-space character or

sql/event_scheduler.cc

@@ -167,7 +167,7 @@ deinit_event_thread(THD *thd)
       thd  The THD of the thread. Has to be allocated by the caller.
 
   NOTES
-    1. The host of the thead is my_localhost
+    1. The host of the thread is my_localhost
     2. thd->net is initted with NULL - no communication.
 */
 

sql/field.cc

@@ -1143,7 +1143,7 @@ Field_longstr::pack_sort_string(uchar *to, const SORT_FIELD_ATTR *sort_field)
   @details
   The function returns a double number between 0.0 and 1.0 as the relative
   position of the value of the this field in the numeric interval of [min,max].
-  If the value is not in the interval the the function returns 0.0 when
+  If the value is not in the interval the function returns 0.0 when
   the value is less than min, and, 1.0 when the value is greater than max.
 
   @param  min  value of the left end of the interval
@@ -1204,7 +1204,7 @@ static inline double safe_substract(ulonglong a, ulonglong b)
   @details
   The function returns a double number between 0.0 and 1.0 as the relative
   position of the value of the this field in the string interval of [min,max].
-  If the value is not in the interval the the function returns 0.0 when
+  If the value is not in the interval the function returns 0.0 when
   the value is less than min, and, 1.0 when the value is greater than max.
 
   @note

sql/filesort.cc

@@ -2420,7 +2420,7 @@ get_addon_fields(TABLE *table, uint sortlength,
 
   /*
     If there is a reference to a field in the query add it
-    to the the set of appended fields.
+    to the set of appended fields.
     Note for future refinement:
     This this a too strong condition.
     Actually we need only the fields referred in the

sql/ha_partition.cc

@@ -149,7 +149,7 @@ partition_notify_tabledef_changed(handlerton *,
 
 
 /*
-  If frm_error() is called then we will use this to to find out what file
+  If frm_error() is called then we will use this to find out what file
   extensions exist for the storage engine. This is also used by the default
   rename_table and delete_table method in handler.cc.
 */
@@ -9791,7 +9791,7 @@ ha_rows ha_partition::min_rows_for_estimate()
     All partitions might have been left as unused during partition pruning
     due to, for example, an impossible WHERE condition. Nonetheless, the
     optimizer might still attempt to perform (e.g. range) analysis where an
-    estimate of the the number of rows is calculated using records_in_range.
+    estimate of the number of rows is calculated using records_in_range.
     Hence, to handle this and other possible cases, use zero as the minimum
     number of rows to base the estimate on if no partition is being used.
   */

sql/ha_partition.h

@@ -271,7 +271,7 @@ typedef struct st_partition_part_key_multi_range_hld
   /* Owner object */
   ha_partition *partition;
 
-  /* id of the the partition this structure is for */
+  /* id of the partition this structure is for */
   uint32 part_id;
 
   /* Current range we're iterating through */