Remove escaping of '|' in manpage option sections

The escaped were ending up verbatim in the generated documentation.

Signed-off-by: Jonas Fonseca <fonseca@diku.dk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-filter-branch.txt

@@ -152,7 +152,7 @@ definition impossible to preserve signatures at any rate.)
 	does this in the '.git-rewrite/' directory but you can override
 	that choice by this parameter.
 
--f\|--force::
+-f|--force::
 	`git filter-branch` refuses to start with an existing temporary
 	directory or when there are already refs starting with
 	'refs/original/', unless forced.

Documentation/git-stripspace.txt

@@ -16,7 +16,7 @@ Remove multiple empty lines, and empty lines at beginning and end.
 
 OPTIONS
 -------
--s\|--strip-comments::
+-s|--strip-comments::
 	In addition to empty lines, also strip lines starting with '#'.
 
 <stream>::