Fix typos in some comments

mysys/lf_alloc-pin.c

@@ -161,7 +161,7 @@ LF_PINS *lf_pinbox_get_pins(LF_PINBOX *pinbox)
     pinstack_top_ver is 32 bits; 16 low bits are the index in the
     array, to the first element of the list. 16 high bits are a version
     (every time the 16 low bits are updated, the 16 high bits are
-    incremented). Versioniong prevents the ABA problem.
+    incremented). Versioning prevents the ABA problem.
   */
   top_ver= pinbox->pinstack_top_ver;
   do

sql/sql_lex.h

@@ -742,7 +742,7 @@ class st_select_lex_unit: public st_select_lex_node {
   /* thread handler */
   THD *thd;
   /*
-    SELECT_LEX for hidden SELECT in onion which process global
+    SELECT_LEX for hidden SELECT in union which process global
     ORDER BY and LIMIT
   */
   st_select_lex *fake_select_lex;