Documentation: fix a typo in git-apply.txt

git-apply accepts the --cached option, not --cache.

Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-apply.txt

diff --git a/Documentation/git-apply.txt b/Documentation/git-apply.txt
index 881652f..2dcfc09 100644
--- a/Documentation/git-apply.txt
+++ b/Documentation/git-apply.txt
@@ -22,7 +22,7 @@
 -----------
 Reads the supplied diff output (i.e. "a patch") and applies it to files.
 With the `--index` option the patch is also applied to the index, and
-with the `--cache` option the patch is only applied to the index.
+with the `--cached` option the patch is only applied to the index.
 Without these options, the command applies the patch only to files,
 and does not require them to be in a git repository.