doc: Add documentation for the whitelist options

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/codecs.texi

@@ -1114,6 +1114,10 @@ Interlaced video, bottom coded first, top displayed first
 Set to 1 to disable processing alpha (transparency). This works like the
 @samp{gray} flag in the @option{flags} option which skips chroma information
 instead of alpha. Default is 0.
+
+@item codec_whitelist @var{list} (@emph{input})
+"," separated List of allowed decoders. By default all are allowed.
+
 @end table
 
 @c man end CODEC OPTIONS

doc/formats.texi

@@ -168,6 +168,10 @@ The offset is added by the muxer to the output timestamps.
 Specifying a positive offset means that the corresponding streams are
 delayed bt the time duration specified in @var{offset}. Default value
 is @code{0} (meaning that no offset is applied).
+
+@item format_whitelist @var{list} (@emph{input})
+"," separated List of allowed demuxers. By default all are allowed.
+
 @end table
 
 @c man end FORMAT OPTIONS