Documentation: describe subject more precisely

The discussion of email subject throughout the documentation is
misleading; it indicates that the first line will always become
the subject.  In fact, the subject is generally all lines up until
the first full blank line.

This patch refines that, and makes more use of the concept of a
commit title, with the title being all text up to the first blank line.

Signed-off-by: Jeremy White <jwhite@codeweavers.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/Documentation/gitcore-tutorial.txt b/Documentation/gitcore-tutorial.txt
index 9d893369a0..5325c5a7d5 100644
--- a/Documentation/gitcore-tutorial.txt
+++ b/Documentation/gitcore-tutorial.txt
@@ -956,12 +956,11 @@ $ git show-branch --topo-order --more=1 master mybranch
 ------------------------------------------------
 
 The first two lines indicate that it is showing the two branches
-and the first line of the commit log message from their
-top-of-the-tree commits, you are currently on `master` branch
-(notice the asterisk `*` character), and the first column for
-the later output lines is used to show commits contained in the
+with the titles of their top-of-the-tree commits, you are currently on
+`master` branch (notice the asterisk `*` character), and the first
+column for the later output lines is used to show commits contained in the
 `master` branch, and the second column for the `mybranch`
-branch. Three commits are shown along with their log messages.
+branch. Three commits are shown along with their titles.
 All of them have non blank characters in the first column (`*`
 shows an ordinary commit on the current branch, `-` is a merge commit), which
 means they are now part of the `master` branch. Only the "Some