[PATCH/RFC] Documentation: add a FILES section for show-ref

A peek at where the refs are kept might help understanding, even if,
as the DESCRIPTION section suggests, direct access is not part of the
public API.

Balance that out with a pointer to update-ref.

Suggested-by: Geoff Russell <redacted>
Signed-off-by: Jonathan Nieder <redacted>
---
 Documentation/git-show-ref.txt |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/Documentation/git-show-ref.txt b/Documentation/git-show-ref.txt
index 3f9d9c6..3fe961d 100644
--- a/Documentation/git-show-ref.txt
+++ b/Documentation/git-show-ref.txt

@@ -163,9 +163,15 @@ flag, so you can do
 
 to get a listing of all tags together with what they dereference.
 
+FILES
+-----
+`.git/refs/*`, `.git/packed-refs`
+
 SEE ALSO
 --------
-linkgit:git-ls-remote[1]
+linkgit:git-ls-remote[1],
+linkgit:git-update-ref[1],
+linkgit:gitrepository-layout[5]
 
 AUTHORS
 -------

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1.7.2.1.544.ga752d.dirty