docs: change official IRC channel to #buildroot

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

docs/docs.html

@@ -20,8 +20,8 @@ help:</p>
   <li>On the <a href="lists.html">buildroot mailing list</a>
   at <code>buildroot at uclibc.org</code></li>
 
-  <li>On the <a href="irc://freenode.net/#uclibc">Buildroot IRC
-  channel</a>, <code>#uclibc</code> on Freenode</li>
+  <li>On the <a href="irc://freenode.net/#buildroot">Buildroot IRC
+  channel</a>, <code>#buildroot</code> on Freenode</li>
 
   <li>On our <a href="https://bugs.uclibc.org">bugtracker</a>.</li>