regex: use regexec_buf()

diff --git a/Documentation/git-commit-tree.txt b/Documentation/git-commit-tree.txt
index f5f2a8d326502714299cf85d9819bb065d5af390..48c33d7ed7323c7fc4776ffeb98aad9b41b23744 100644 (file)
--- a/Documentation/git-commit-tree.txt
+++ b/Documentation/git-commit-tree.txt
@@ -9,7 +9,7 @@ git-commit-tree - Create a new commit object
 SYNOPSIS
 --------
 [verse]
-'git commit-tree' <tree> [(-p <parent>)...] < changelog
+'git commit-tree' <tree> [(-p <parent>)...]
 'git commit-tree' [(-p <parent>)...] [-S[<keyid>]] [(-m <message>)...]
                  [(-F <file>)...] <tree>
 
@@ -56,7 +56,9 @@ OPTIONS
 
 -S[<keyid>]::
 --gpg-sign[=<keyid>]::
-       GPG-sign commit.
+       GPG-sign commits. The `keyid` argument is optional and
+       defaults to the committer identity; if specified, it must be
+       stuck to the option without a space.
 
 --no-gpg-sign::
        Countermand `commit.gpgSign` configuration variable that is