docs: improve the system table chapter

docs/en/12-taos-sql/22-meta.md

@@ -14,7 +14,7 @@ TDengine includes a built-in database named `INFORMATION_SCHEMA` to provide acce
 :::info
 
 - SHOW statements are still supported for the convenience of existing users.
-- Some columns in the system table may be keywords, and you need to use the escape character '\`' when querying, for example, the query database test has several VGROUPs:
+- Some columns in the system table may be keywords, and you need to use the escape character '\`' when querying, for example, to query the VGROUPS in the database `test`:
 ```sql 
    select `vgroups` from ins_databases where name = 'test';
 ``` 
@@ -111,9 +111,9 @@ Provides information about user-created databases. Similar to SHOW DATABASES.
 | 25  |  wal_retention_size  | INT              | Maximum WAL size                                   |
 | 26  |   wal_roll_period    | INT              | WAL rotation period                                 |
 | 27  |   wal_segment_size   | BIGINT | WAL file size |
-| 28  |   stt_trigger   | SMALLINT | The number of files placed on the disk that trigger file merging |
-| 29  |   table_prefix   | SMALLINT | The table name is used for the prefix length that needs to be ignored when calculating the consistent HASH |
-| 30  |   table_suffix   | SMALLINT | The table name is used for the suffix length that needs to be ignored when calculating the consistent HASH |
+| 28  |   stt_trigger   | SMALLINT | The threshold for number of files to trigger file merging |
+| 29  |   table_prefix   | SMALLINT | The prefix length in the table name that is ignored when distributing table to vnode based on table name |
+| 30  |   table_suffix   | SMALLINT | The suffix length in the table name that is ignored when distributing table to vnode based on table name |
 | 31  |   tsdb_pagesize   | INT | Page size for vnode data storage engine, in KB |
 
 ## INS_FUNCTIONS