remove documentation of 'global' section in modules.conf, since it is no longer needed or supported

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@41054 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/modules.conf.sample

@@ -36,8 +36,3 @@ load => res_musiconhold.so
 ;
 noload => chan_alsa.so
 ;noload => chan_oss.so
-;
-; Module names listed in "global" section will have symbols globally
-; exported to modules loaded after them.
-;
-[global]