[FFmpeg-cvslog] doc/fftools-common-opts: document ffmpeg -h protocol=protocol_name

[Jun Zhao]

ffmpeg | branch: master | Jun Zhao <barryjzhao at tencent.com> | Fri Aug  7 21:20:05 2020 +0800| [b9ff25a93e9bd7002b18b2bdca6b6a77d7ceb6a0] | committer: Jun Zhao

doc/fftools-common-opts: document ffmpeg -h protocol=protocol_name

document ffmpeg -h protocol=protocol_name

Reviewed-by: Gyan Doshi <ffmpeg at gyani.pro>
Signed-off-by: Jun Zhao <barryjzhao at tencent.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b9ff25a93e9bd7002b18b2bdca6b6a77d7ceb6a0
---

 doc/fftools-common-opts.texi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/fftools-common-opts.texi b/doc/fftools-common-opts.texi
index acdaa26d90..2c94eaefd4 100644
--- a/doc/fftools-common-opts.texi
+++ b/doc/fftools-common-opts.texi
@@ -113,6 +113,10 @@ Print detailed information about the filter named @var{filter_name}. Use the
 @item bsf=@var{bitstream_filter_name}
 Print detailed information about the bitstream filter named @var{bitstream_filter_name}.
 Use the @option{-bsfs} option to get a list of all bitstream filters.
+
+ at item protocol=@var{protocol_name}
+Print detailed information about the protocol named @var{protocol_name}.
+Use the @option{-protocols} option to get a list of all protocols.
 @end table
 
 @item -version