cfg80211 docbook: remove erronous !A

My previous patch erroneously included an
!A line (for some checking I am working on)
that isn't yet supported by the docbook
tools, so remove it.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Documentation/DocBook/80211.tmpl

@@ -65,7 +65,6 @@
     </abstract>
   </setinfo>
   <book id="cfg80211-developers-guide">
-!Ainclude/net/cfg80211.h
     <bookinfo>
       <title>The cfg80211 subsystem</title>