[PATCH] githooks documentation: post-checkout hook is also called after clone

The documentation of the post-checkout hook just talks
about git-checkout. But recently git-clone was changed to
call it too, so we have to document that in githooks.txt.

Signed-off-by: Jens Lehmann <redacted>
---
 Documentation/githooks.txt |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index 1fd512b..76deefc 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt

@@ -151,6 +151,9 @@ indicating whether the checkout was a branch checkout (changing branches,

 flag=1) or a file checkout (retrieving a file from the index, flag=0).
 This hook cannot affect the outcome of 'git-checkout'.

+It is also run after 'git-clone'. The first parameter given to the hook is
+the null-ref, the second the ref of the new HEAD and the flag is always 1.
+