[PATCH] doc: add note about ignoring --no-create-reflog

[cornelius.weig@tngtech.com]

From: Cornelius Weig <cornelius.weig@tngtech.com>

The commands git-branch and git-tag accept a `--create-reflog` argument.
On the other hand, the negated form `--no-create-reflog` is accepted as
a valid option but has no effect. This silent noop may puzzle users.

To communicate that this behavior is intentional, add a short note in
the manuals for git-branch and git-tag.

Signed-off-by: Cornelius Weig <cornelius.weig@tngtech.com>
---

Notes:
    In a previous discussion (<xmqqbmunrwbf.fsf@gitster.mtv.corp.google.com>) it
    was found that git-branch and git-tag accept a "--no-create-reflog" argument,
    but it has no effect, does not produce a warning, and is undocumented.

 Documentation/git-branch.txt | 1 +
 Documentation/git-tag.txt    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Documentation/git-branch.txt b/Documentation/git-branch.txt
index 1fae4ee..fca3754 100644
--- a/Documentation/git-branch.txt
+++ b/Documentation/git-branch.txt
@@ -91,6 +91,7 @@ OPTIONS
 	based sha1 expressions such as "<branchname>@\{yesterday}".
 	Note that in non-bare repositories, reflogs are usually
 	enabled by default by the `core.logallrefupdates` config option.
+	The negated form `--no-create-reflog` is silently ignored.
 
 -f::
 --force::
diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index 5b2288c..b0b933e 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -152,6 +152,7 @@ This option is only applicable when listing tags without annotation lines.
 --create-reflog::
 	Create a reflog for the tag. To globally enable reflogs for tags, see
 	`core.logAllRefUpdates` in linkgit:git-config[1].
+	The negated form `--no-create-reflog` is silently ignored.
 
 <tagname>::
 	The name of the tag to create, delete, or describe.
-- 
2.10.2