docs: mention that the new password must be different from the old password (#2266)

* docs: mention that the new password must be different from the old password

* Update docs/kratos/self-service/flows/user-settings.mdx

Shortened it to "This ensures that a new, unique password is set, and prevents the reuse of a potentially compromised password."

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

* reword

* make format

---------

Co-authored-by: unatasha8 <[email protected]>
Co-authored-by: Vincent <[email protected]>

Author: 3 people

docs/kratos/self-service/flows/user-settings.mdx

@@ -542,6 +542,11 @@ curl -s -X GET \
 }
 ```
 
+The new password must be different from the current one. Attempting to reuse an old password will trigger an error:
+`The new password must be different from the old password.`
+
+This ensures that a new, unique password is set, and prevents the reuse of a potentially compromised password.
+
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