[PATCH v4 3/5] fmt-merge-msg: Update fmt-merge-msg and merge-config documentation

[Ramkumar Ramachandra <artagnon@gmail.com>]

Update the documentation of fmt-merge-msg and merge-config to reflect
the fact that `merge.log` can either be a boolean or integer option
now, instead of just a boolean.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Cc: Johannes Sixt <j.sixt <at> viscovery.net>
Cc: Jonathan Nieder <jrnieder <at> gmail.com>
---
 Documentation/git-fmt-merge-msg.txt |   15 +++++++++------
 Documentation/merge-config.txt      |    8 ++++++--
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/Documentation/git-fmt-merge-msg.txt b/Documentation/git-fmt-merge-msg.txt
index 302f56b..9499322 100644
--- a/Documentation/git-fmt-merge-msg.txt
+++ b/Documentation/git-fmt-merge-msg.txt
@@ -9,8 +9,8 @@ git-fmt-merge-msg - Produce a merge commit message
 SYNOPSIS
 --------
 [verse]
-'git fmt-merge-msg' [-m <message>] [--log | --no-log] <$GIT_DIR/FETCH_HEAD
-'git fmt-merge-msg' [-m <message>] [--log | --no-log] -F <file>
+'git fmt-merge-msg' [-m <message>] [--[no-]log[=<n>]] < $GIT_DIR/FETCH_HEAD
+'git fmt-merge-msg' [-m <message>] [--[no-]log[=<n>]] -F <file>
 
 DESCRIPTION
 -----------
@@ -24,10 +24,10 @@ automatically invoking 'git merge'.
 OPTIONS
 -------
 
---log::
+--log[=<n>]::
 	In addition to branch names, populate the log message with
-	one-line descriptions from the actual commits that are being
-	merged.
+	one-line descriptions from at most <n> actual commits that are
+	being merged. If omitted, <n> defaults to 20.
 
 --no-log::
 	Do not list one-line descriptions from the actual commits being
@@ -53,7 +53,10 @@ CONFIGURATION
 
 merge.log::
 	Whether to include summaries of merged commits in newly
-	merge commit messages. False by default.
+	created merge commit messages.  Optionally, an integer can be
+	used to specify how many merged commits to summarize (at
+	maxmium) in the merge message. Specifying "true" is equivalent
+	to specifying 20. Defaults to false.
 
 merge.summary::
 	Synonym to `merge.log`; this is deprecated and will be removed in
diff --git a/Documentation/merge-config.txt b/Documentation/merge-config.txt
index b72f533..f63f7cb 100644
--- a/Documentation/merge-config.txt
+++ b/Documentation/merge-config.txt
@@ -7,8 +7,12 @@ merge.conflictstyle::
 	marker and the original text before the `=======` marker.
 
 merge.log::
-	Whether to include summaries of merged commits in newly created
-	merge commit messages. False by default.
+	Whether to include summaries of merged commits in newly
+	created merge commit messages.  Optionally, an integer can be
+	used to specify how many merged commits to summarize (at
+	maxmium) in the merge message. Specifying "true" is equivalent
+	to specifying 20.  Defaults to false. See also
+	linkgit:git-fmt-merge-msg[1].
 
 merge.renameLimit::
 	The number of files to consider when performing rename detection
-- 
1.7.2.2.409.gdbb11.dirty