fix a few problems

Author: huaxingao

docs/sql-ref-syntax-dml-dynamic-partition-insert.md

@@ -57,8 +57,7 @@ INSERT OVERWRITE TABLE data_source_tab2 PARTITION (p1 = 'partNew1', p2)
   VALUES (3, 'partNew2')
 
 -- After this INSERT OVERWRITE, the two partitions ('part1', 'part1') and ('part1', 'part2')
--- are dropped,
--- because both partitions are included by (p1 = 'part1', p2).
+-- are dropped, because both partitions are included by (p1 = 'part1', p2).
 -- Then, two partitions ('partNew1', 'partNew2'), ('part1', 'part1') exist after this
 -- operation.
 INSERT OVERWRITE TABLE data_source_tab2 PARTITION (p1 = 'part1', p2)
@@ -74,8 +73,7 @@ INSERT OVERWRITE TABLE hive_serde_tab2 PARTITION (p1 = 'partNew1', p2)
   VALUES (3, 'partNew2')
 
 -- After this INSERT OVERWRITE, only the partitions ('part1', 'part1') is overwritten by the
--- new value.
--- All the three partitions still exist.
+-- new value. All the three partitions still exist.
 INSERT OVERWRITE TABLE hive_serde_tab2 PARTITION (p1 = 'part1', p2)
   VALUES (5, 'part1')
 {% endhighlight %}

docs/sql-ref-syntax-dml-insert-into.md

@@ -28,7 +28,7 @@ The INSERT INTO statement can be used to insert new rows into a table. The inser
 INSERT INTO [TABLE] [db_name.]table_name [partition_spec] value_clause | query
 
 partition_spec:
-    : (part_col_name1[=val1], part_col_name2[=val2], ...)
+    : (part_col_name1[=val1] [, part_col_name2[=val2], ...])
 
 value_clause:
     : VALUES values_row [, values_row ...]

docs/sql-ref-syntax-dml-insert-overwrite-directory.md

@@ -26,7 +26,7 @@ Insert the query results into a directory using Spark native format. If the spec
 
 {% highlight sql %}
 INSERT OVERWRITE [LOCAL] DIRECTORY [directory_path]
-  USING file_format [OPTIONS (key1=val1, key2=val2, ...)] [AS] query
+  USING file_format [OPTIONS (key1=val1 [, key2=val2, ...])] [AS] query
 {% endhighlight %}
 
 ### Examples

docs/sql-ref-syntax-dml-insert-overwrite-table.md

@@ -29,7 +29,7 @@ INSERT OVERWRITE [TABLE] [db_name.]table_name [partition_spec [IF NOT EXISTS]]
   valueClause | query
 
 partition_spec:
-    : (part_col_name1[=val1], part_col_name2[=val2], ...)
+    (part_col_name1[=val1] [, part_col_name2[=val2], ...])
 
 value_clause:
     : VALUES values_row [, values_row ...]