Fixes unknown meaning in GAppLaunchContext docs. Clarify asynchronous ops.

Fixes unknown meaning in GAppLaunchContext docs. Clarify asynchronous ops.

	* gappinfo.c:
	  Fixes unknown meaning in GAppLaunchContext docs.
	* gfile.c:
	  Clarify asynchronous ops.
	* gfileattribute.c:
	  Fix entity tag docs.
	* gicon.c:
	* gthemedicon.c:
	  Provides missing gtk-doc section, fixes API docs slighly.
	* gsimpleasyncresult.c:
	  Fill in missing info in docs.
	* gunixinputstream.c:
	* gunixoutputstream.c:
	  Be more expressive in short description.
	* gunixvolume.c:
	  Remove gtk-doc stubs for non-public API.

svn path=/trunk/; revision=5994