Remove credit to Philip Gladstone contribution from the ffserver

documentation. Philip Gladstone aka philipjsg contributed the first
version of the section named Quickstart (now incorporated into the
DESCRIPTION section).

Originally committed as revision 14042 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/ffserver-doc.texi

@@ -26,8 +26,6 @@ ffmpeg. All questions about parameters for ffmpeg, codec questions,
 etc. are not covered here. Read @file{ffmpeg-doc.html} for more
 information.
 
-[Contributed by Philip Gladstone, philip-ffserver at gladstonefamily dot net]
-
 @section How does it work?
 
 FFserver receives prerecorded files or FFM streams from some ffmpeg