collation: remove a redundant sentence (#11131)

* collation: remove a redundant sentence

* address #6539

* Update faq/high-reliability-faq.md

Co-authored-by: Aolin <aolin.zhang@pingcap.com>

Co-authored-by: Aolin <aolin.zhang@pingcap.com>

faq/high-reliability-faq.md

@@ -38,6 +38,6 @@ When the client connects to TiDB, the challenge-response authentication mode sta
 
 ## How to modify the user password and privilege?
 
-To modify the user password in TiDB, it is recommended to use `set password for 'root'@'%' = '0101001';` or `alter`, not `update mysql.user` which might lead to the condition that the password in other nodes is not refreshed timely.
+To modify the user password in TiDB, it is recommended to use `ALTER USER` (for example, `ALTER USER 'test'@'localhost' IDENTIFIED BY 'mypass';`), not `UPDATE mysql.user` which might lead to the condition that the password in other nodes is not refreshed timely.
 
 It is recommended to use the official standard statements when modifying the user password and privilege. For details, see [TiDB user account management](/user-account-management.md).

tidb-configuration-file.md

@@ -107,7 +107,7 @@ The TiDB configuration file supports more options than command-line parameters.
 
 - Enables or disables the new collation support.
 - Default value: `true`
-- Note: This configuration takes effect only for the TiDB cluster that is first initialized. After the initialization, you cannot use this configuration item to enable or disable the new collation support. When a TiDB cluster is upgraded to v4.0 or later, because the cluster has been initialized before, both `true` and `false` values of this configuration item are taken as `false`.
+- Note: This configuration takes effect only for the TiDB cluster that is first initialized. After the initialization, you cannot use this configuration item to enable or disable the new collation support.
 
 ### `max-server-connections`