[Doc]Add show tables help documentation (#9568)

docs/.vuepress/sidebar/en.js

@@ -777,6 +777,7 @@ module.exports = [
               "SHOW-STREAM-LOAD",
               "SHOW-SYNC-JOB",
               "SHOW-TABLE-ID",
+              "SHOW-TABLES",
               "SHOW-TABLE-STATUS",
               "SHOW-TABLET",
               "SHOW-TRANSACTION",

docs/.vuepress/sidebar/zh-CN.js

@@ -777,6 +777,7 @@ module.exports = [
               "SHOW-STREAM-LOAD",
               "SHOW-SYNC-JOB",
               "SHOW-TABLE-ID",
+              "SHOW-TABLES",			  
               "SHOW-TABLE-STATUS",
               "SHOW-TABLET",
               "SHOW-TRANSACTION",

docs/en/sql-manual/sql-reference/Show-Statements/SHOW-TABLES.md

@@ -0,0 +1,83 @@
+---
+{
+    "title": "SHOW-TABLES",
+    "language": "en"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+## SHOW-TABLES
+
+### Name
+
+SHOW TABLES
+
+### Description
+
+This statement is used to display all tables under the current db
+
+grammar:
+
+```sql
+SHOW TABLES [LIKE]
+````
+
+illustrate:
+
+1. LIKE: Fuzzy query can be performed according to the table name
+
+### Example
+
+  1. View all tables under DB
+
+     ```sql
+     mysql> show tables;
+     +---------------------------------+
+     | Tables_in_demo                  |
+     +---------------------------------+
+     | ads_client_biz_aggr_di_20220419 |
+     | cmy1                            |
+     | cmy2                            |
+     | intern_theme                    |
+     | left_table                      |
+     +---------------------------------+
+     5 rows in set (0.00 sec)
+     ````
+
+2. Fuzzy query by table name
+
+    ```sql
+    mysql> show tables like '%cm%';
+    +----------------+
+    | Tables_in_demo |
+    +----------------+
+    | cmy1           |
+    | cmy2           |
+    +----------------+
+    2 rows in set (0.00 sec)
+    ````
+
+### Keywords
+
+    SHOW, TABLES
+
+### Best Practice
+

docs/zh-CN/sql-manual/sql-reference/Show-Statements/SHOW-TABLES.md

@@ -0,0 +1,83 @@
+---
+{
+    "title": "SHOW-TABLES",
+    "language": "zh-CN"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+## SHOW-TABLES
+
+### Name 
+
+SHOW TABLES
+
+### Description
+
+该语句用于展示当前 db 下所有的 table
+
+语法：
+
+```sql
+SHOW TABLES [LIKE]
+```
+
+说明:
+
+1. LIKE：可按照表名进行模糊查询
+
+### Example
+
+ 1. 查看DB下所有表
+    
+     ```sql
+     mysql> show tables;
+     +---------------------------------+
+     | Tables_in_demo                  |
+     +---------------------------------+
+     | ads_client_biz_aggr_di_20220419 |
+     | cmy1                            |
+     | cmy2                            |
+     | intern_theme                    |
+     | left_table                      |
+     +---------------------------------+
+     5 rows in set (0.00 sec)
+     ```
+
+2. 按照表名进行模糊查询
+
+   ```sql
+   mysql> show tables like '%cm%';
+   +----------------+
+   | Tables_in_demo |
+   +----------------+
+   | cmy1           |
+   | cmy2           |
+   +----------------+
+   2 rows in set (0.00 sec)
+   ```
+
+### Keywords
+
+    SHOW, TABLES
+
+### Best Practice
+