docs/website/support.html: document irc channel permission changes

The #buildroot IRC channel recently changed from only allowing
registered users to join to allowing anyone to join but only allowing
registered users to talk in the channel. This still avoids the spam
problem on IRC while allowing an exception for users bridged from
matrix.org. These already have a username registered on the matrix side
and thus similar properties as a registered IRC user/nick.

The commands to set these options were:

* Set +q on all unregistered nicks: ~/mode #buildroot +q $~a~ this lets
  people join but they can't talk
* Set exempt on matrix hosts: ~/mode #buildroot +e $x:matrix.org~

Signed-off-by: Marcus Hoffmann <[email protected]>
Signed-off-by: Yann E. MORIN <[email protected]>

docs/website/support.html

@@ -27,8 +27,8 @@
 		    When asking for help on IRC, share relevant logs or pieces of code using a code
 		    sharing website.</p>
 
-		  <p>Note that due to excessive spamming on IRC, the channel can only be
-		    joined if you are a registered user with
+		  <p>Note that due to excessive spamming on IRC, you can only talk in the
+		    channel if you are a registered user with
 		    <a href="https://www.oftc.net/Services/">OFTC NickServ</a>
 		    service. Follow the instructions to register as a user with a password,
 		    and then join the <code>#buildroot</code> channel.</p>