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 <mchehab@s-opensource.com>
diff --git a/Documentation/sphinx/parse-headers.pl b/Documentation/sphinx/parse-headers.pl
index 0a3703b..34bd9e2 100755
--- a/Documentation/sphinx/parse-headers.pl
+++ b/Documentation/sphinx/parse-headers.pl
@@ -303,6 +303,8 @@
 	$data =~ s/($start_delim)($r)$end_delim/$1$s$3/g;
 }
 
+$data =~ s/\\ \n/\n/g;
+
 #
 # Generate output file
 #