ls-files: fix --ignored and --killed flags in synopsis

Signed-off-by: Vincent Bernat <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: vincentbernat

Documentation/git-ls-files.txt

@@ -10,8 +10,8 @@ SYNOPSIS
 --------
 [verse]
 'git ls-files' [-z] [-t] [-v] [-f]
-		[-c|--cached] [-d|--deleted] [-o|--others] [-i|--|ignored]
-		[-s|--stage] [-u|--unmerged] [-k|--|killed] [-m|--modified]
+		[-c|--cached] [-d|--deleted] [-o|--others] [-i|--ignored]
+		[-s|--stage] [-u|--unmerged] [-k|--killed] [-m|--modified]
 		[--directory [--no-empty-directory]] [--eol]
 		[--deduplicate]
 		[-x <pattern>|--exclude=<pattern>]