Shorten Documentation link to Doc.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/web/trunk@4196 92316355-f0b4-4df1-b90c-862c8a59935f

trac/conf/trac.ini

@@ -31,7 +31,7 @@ log_level = INFO
 log_type = file
 
 [mainnav]
-doxygen.label = Documentation
+doxygen.label = Doc
 newticket.label = Report a Bug
 tickets.href = /report/1
 tickets.label = Bug Reports