setup.c: detect $GIT_COMMON_DIR in is_git_directory()

diff --git a/Documentation/git-fmt-merge-msg.txt b/Documentation/git-fmt-merge-msg.txt
index 3a0f55ec8e273545af3a92a9b886511ac79ba73c..bb1232a52c4f0e4995f1fd38737461165772c239 100644 (file)
--- a/Documentation/git-fmt-merge-msg.txt
+++ b/Documentation/git-fmt-merge-msg.txt
@@ -35,8 +35,7 @@ OPTIONS
        Do not list one-line descriptions from the actual commits being
        merged.
 
---summary::
---no-summary::
+--[no-]summary::
        Synonyms to --log and --no-log; these are deprecated and will be
        removed in the future.