Update docs.md

documentation20/en/05.insert/docs.md

@@ -95,7 +95,7 @@ After MD5 value "md5_val" calculated using the above string, prefix "t_" is adde
 <br/>Following protocols are supported in Schemaless:
 
 | **ID** |         **Value**          |         **Description**         |
-| ---- | ------------------- | ------------ |
+| ---- | ---------------------------- | ------------------------------- |
 | 1    | SML_LINE_PROTOCOL            |    InfluxDB Line Protocol       |
 | 2    | SML_TELNET_PROTOCOL          |  OpenTSDB telnet Protocol       |
 | 3    | SML_JSON_PROTOCOL            |  OpenTSDB JSON format Protocol  |
@@ -103,7 +103,7 @@ After MD5 value "md5_val" calculated using the above string, prefix "t_" is adde
 <br/>When SML_LINE_PROTOCOL used，users need to indicate timestamp precision through API。Available timestamp resolutions are：<br/>
 
 | **ID** |       **Precision Definition **       |   **Meaning**  |
-| ---- | ----------------------------- | --------- |
+| ------ | ------------------------------------- | -------------- |
 | 1      | TSDB_SML_TIMESTAMP_NOT_CONFIGURED     |   undefined    |
 | 2      | TSDB_SML_TIMESTAMP_HOURS              |   hour         |
 | 3      | TSDB_SML_TIMESTAMP_MINUTES            |   minute       |