doc/rdsrc: don't treat \# as a comment marker if preceeded by \
doc/rdsrc: don't treat \# as a comment marker if preceeded by \

We need to be able to let \\# represent a literal \#, rather than
be \ followed by a comment.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm