dont attach huge samplesto mails

Originally committed as revision 9284 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/ffmpeg-doc.texi

@@ -1708,6 +1708,8 @@ do not attach several unrelated patches to the same mail.
 @item
     If the patch fixes a bug, did you provide enough information, including
     a sample, so the bug can be reproduced and the fix can be verified?
+    Note please do not attach samples >100k to mails but rather provide a
+    URL, you can upload to ftp://upload.mplayerhq.hu
 @item
     Did you provide a verbose summary about what the patch does change?
 @item