user-manual: use pithier example commit

diff --git a/Documentation/git-commit-tree.txt b/Documentation/git-commit-tree.txt
index 77ba96ed8a4820354ef6d2ff4265660385289f3d..504a3aa1b460ffac9308bec4ff72cf657f8fec30 100644 (file)
--- a/Documentation/git-commit-tree.txt
+++ b/Documentation/git-commit-tree.txt
@@ -3,7 +3,7 @@ git-commit-tree(1)
 
 NAME
 ----
-git-commit-tree - Creates a new commit object
+git-commit-tree - Create a new commit object
 
 
 SYNOPSIS
@@ -12,6 +12,9 @@ SYNOPSIS
 
 DESCRIPTION
 -----------
+This is usually not what an end user wants to run directly.  See
+gitlink:git-commit[1] instead.
+
 Creates a new commit object based on the provided tree object and
 emits the new commit object id on stdout. If no parent is given then
 it is considered to be an initial tree.
@@ -57,6 +60,8 @@ either `.git/config` file, or using the following environment variables.
        GIT_AUTHOR_DATE
        GIT_COMMITTER_NAME
        GIT_COMMITTER_EMAIL
+       GIT_COMMITTER_DATE
+       EMAIL
 
 (nb "<", ">" and "\n"s are stripped)