remove empty awk pattern (//)

Solaris 10 nawk doesn't like the empty pattern such as '//' for 'always'.
Just remove that. No pattern at all always matches.

Merged revisions 226453 via svnmerge from 
http://svn.digium.com/svn/asterisk/trunk


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@226486 65c4cc65-6c06-0410-ace0-fbb531ad65f3

build_tools/get_documentation

@@ -1,3 +1,3 @@
 /\/\*\*\* DOCUMENTATION/ {printit=1; next}
 /\*\*\*\// {if (printit) exit}
-// {if (printit) print}
+{if (printit) print}