*: fix alter add unique syntax (#912)

Via: pingcap/docs-cn#1129
pingcap · Feb 21, 2019 · 5dc0a30 · 5dc0a30
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diff --git a/v1.0/QUICKSTART.md b/v1.0/QUICKSTART.md
@@ -131,7 +131,7 @@ CREATE UNIQUE INDEX person_num ON person (number);
 or
 
 ```sql
-ALTER TABLE person ADD UNIQUE person_num on (number);
+ALTER TABLE person ADD UNIQUE person_num (number);
 ```
 
 Use the `SHOW INDEX` to display all the indexes in a table:

diff --git a/v2.0/QUICKSTART.md b/v2.0/QUICKSTART.md
@@ -135,7 +135,7 @@ This section describes some basic CRUD operations in TiDB.
     or
 
     ```sql
-    ALTER TABLE person ADD UNIQUE person_num on (number);
+    ALTER TABLE person ADD UNIQUE person_num (number);
     ```
 
 - To show all the indexes in a table, use the `SHOW INDEX` statement:

diff --git a/v2.1/try-tidb.md b/v2.1/try-tidb.md
@@ -131,7 +131,7 @@ DROP TABLE IF EXISTS person;
     or
 
     ```sql
-    ALTER TABLE person ADD UNIQUE person_num on (number);
+    ALTER TABLE person ADD UNIQUE person_num (number);
     ```
 
 ### Show the indexes