docs: add comma to please spellcheck

apps/emqx/i18n/emqx_schema_i18n.conf

@@ -2050,7 +2050,7 @@ base_listener_enable_authn {
 Set <code>true</code> (default) to enable client authentication on this listener, the authentication
 process goes through the configured authentication chain.
 When set to <code>false</code> to allow any clients with or without authentication information such as username or password to log in.
-When set to <code>quick_deny_anonymous</code>, it behaves like when set to <code>true</code> but clients will be
+When set to <code>quick_deny_anonymous</code>, it behaves like when set to <code>true</code>, but clients will be
 denied immediately without going through any authenticators if <code>username</code> is not provided. This is useful to fence off
 anonymous clients early.
 """