[PATCH v2] git-commit.txt: clarify -t requires editing message

[Adam Monsen <haircut@gmail.com>]

Make it clear that, when using a commit template, the message *must* be
changed or the commit will be aborted "due to empty commit message".

Helped-by: Ivan Heffner <iheffner@gmail.com>
Signed-off-by: Adam Monsen <haircut@gmail.com>
---
Incorporate feedback from Ivan Heffner.

Anyone else agree/disagree with this patch? I would like to see the
manpage improved because I found the behavior of "git commit -t"
confusing as documented.

I wrapped the text at 77 characters because that was the longest
line in the file (according to wc -L).

I used ":set noet nosta ts=8 sw=8 tw=77" in Vim.

 Documentation/git-commit.txt |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index 5cc84a1..c6df120 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -133,10 +133,12 @@ OPTIONS
 -t <file>::
 --template=<file>::
 	Use the contents of the given file as the initial version
-	of the commit message. The editor is invoked and you can
-	make subsequent changes. If a message is specified using
-	the `-m` or `-F` options, this option has no effect. This
-	overrides the `commit.template` configuration variable.
+	of the commit message. The editor is invoked so you can
+	make subsequent changes. If you make no changes, the message
+	is considered empty and the commit is aborted. If a message
+	is specified using the `-m` or `-F` options, this option has
+	no effect. This overrides the `commit.template`
+	configuration variable.
 
 -s::
 --signoff::
-- 
1.7.5.4