docs: add some must_change_password examples (#969)

* docs: add some `must_change_password` examples

* fix

---------

Co-authored-by: Quan <[email protected]>

Author: b41sh

docs/en/guides/56-security/password-policy.md

@@ -30,7 +30,7 @@ When a user attempts to log in with a password policy in place, Databend perform
 
 - **Maximum Age Requirement**:
     - Checks if the maximum password change interval has been exceeded.
-    - If the interval is exceeded, the user is restricted from logging in until the password is changed.
+    - If the interval is exceeded, the user can change the password after login, and cannot perform any other operations before the password is changed.
 
 ## Managing Password Policies