doc-rst: parse-headers: remove trailing spaces

The function that replace references add a "\ " at the end of
references, to avoid the ReST markup parser to not identify
them as references. That works fine except for the end of lines,
as a sequence of { '\', ' ', '\n' } characters makes Sphinx
to ignore the end of line. So, strip those escape/spaces at the
end of lines.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/sphinx/parse-headers.pl

···
 	$data =~ s/($start_delim)($r)$end_delim/$1$s$3/g;
 }
 
+$data =~ s/\\ \n/\n/g;
+
 #
 # Generate output file
 #