Fix spelling

Originally committed as revision 15666 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/faq.texi

@@ -60,7 +60,7 @@ that it is related to FFmpeg.
 
 You may view our mailing lists with a more forum-alike look here:
 @url{http://dir.gmane.org/gmane.comp.video.ffmpeg.user},
-but, if you post, please remember that our mail list rules still apply there.
+but, if you post, please remember that our mailing list rules still apply there.
 
 @section I cannot read this file although this format seems to be supported by ffmpeg.