Remove note about Grantlee being experimental.

Mainpage.dox

@@ -15,8 +15,6 @@ namespace Grantlee
 
   %Grantlee is covered by the GNU Lesser General Public Licence version 2.1 or, at your option, any later version.
 
-  @note This version of %Grantlee is experimental API. There will likely be minor backwards source and binary incompatible changes in the next minor version.
-
   <table class="main_api" >
     <tr><th class="library" colspan="3">%Grantlee Templates</th></tr>
     <tr><th class="section" >Application API</th><th class="section">%Plugin API</th><th class="section">Guides</th></tr>