doc: kick can take a reason arg

webclient/settings/settings.html

@@ -81,7 +81,7 @@
             <ul>
                 <li>/nick &lt;display_name&gt;: change your display name</li>
                 <li>/me &lt;action&gt;: send the action you are doing. /me will be replaced by your display name</li>
-                <li>/kick &lt;user_id&gt;: kick the user</li>
+                <li>/kick &lt;user_id&gt; [&lt;reason&gt;]: kick the user</li>
                 <li>/ban &lt;user_id&gt; [&lt;reason&gt;]: ban the user</li>
                 <li>/unban &lt;user_id&gt;: unban the user</li>
                 <li>/op &lt;user_id&gt; &lt;power_level&gt;: set user power level</li>