remove redundant docs

Author: bowenliang123

docs/deployment/settings.md

@@ -140,7 +140,7 @@ kyuubi.authentication|NONE|A comma separated list of client authentication types
 kyuubi.authentication.custom.class|<undefined>|User-defined authentication implementation of org.apache.kyuubi.service.authentication.PasswdAuthenticationProvider|string|1.3.0
 kyuubi.authentication.jdbc.driver.class|<undefined>|Driver class name for JDBC Authentication Provider.|string|1.6.0
 kyuubi.authentication.jdbc.password|<undefined>|Database password for JDBC Authentication Provider.|string|1.6.0
-kyuubi.authentication.jdbc.query|<undefined>|Query SQL template with placeholders for JDBC Authentication Provider to execute. Authentication passes if the result set is not empty.The SQL statement must start with the SELECT clause. Available placeholders are `${user}` and `${password}`.|string|1.6.0
+kyuubi.authentication.jdbc.query|<undefined>|Query SQL template with placeholders for JDBC Authentication Provider to execute. Authentication passes if the result set is not empty.The SQL statement must start with the `SELECT` clause. Available placeholders are `${user}` and `${password}`.|string|1.6.0
 kyuubi.authentication.jdbc.url|<undefined>|JDBC URL for JDBC Authentication Provider.|string|1.6.0
 kyuubi.authentication.jdbc.user|<undefined>|Database user for JDBC Authentication Provider.|string|1.6.0
 kyuubi.authentication.ldap.attrs|mail|Specifies part of the search as an attribute returned by LDAP. For example: mail,name.|seq|1.6.0

docs/security/jdbc.md

@@ -20,7 +20,7 @@
 
 Kyuubi supports authentication via JDBC query. A query is prepared with user/password value and sent to the database configured in JDBC URL. Authentication passes if the result set is not empty.
 
-The query sql must start with `SELECT`. The SQL statement must start with the SELECT clause. Placeholders are supported and listed below for substitution:
+The SQL statement must start with the `SELECT` clause. Placeholders are supported and listed below for substitution:
 - `${user}`
 - `${password}`
 

kyuubi-common/src/main/scala/org/apache/kyuubi/config/KyuubiConf.scala

@@ -707,7 +707,7 @@ object KyuubiConf {
       .doc("Query SQL template with placeholders " +
         "for JDBC Authentication Provider to execute. " +
         "Authentication passes if the result set is not empty." +
-        "The SQL statement must start with the SELECT clause. " +
+        "The SQL statement must start with the `SELECT` clause. " +
         "Available placeholders are `${user}` and `${password}`.")
       .version("1.6.0")
       .stringConf