Added observer.webname

doc/bbcode.html

@@ -78,6 +78,7 @@ or<br /><br />[dl terms="b"]<br />[*= First element term] First element descript
 <li>[observer.baseurl] website of observer</li>
 <li>[observer.url] channel URL of observer</li>
 <li>[observer.name] name of observer</li>
+<li>[observer.webname] short name in the url of the observer</li>
 <li>[observer.address] address (zot-id) of observer</li>
 <li>[observer.photo] profile photo of observer<br /></li>