merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 10 insertions, 4 deletions

diff --git a/third_party/git/Documentation/git-check-ignore.txt b/third_party/git/Documentation/git-check-ignore.txt
index 8b42cb3fb20a..0c3924a63d2f 100644
--- a/third_party/git/Documentation/git-check-ignore.txt
+++ b/third_party/git/Documentation/git-check-ignore.txt
@@ -30,16 +30,22 @@ OPTIONS
 	valid with a single pathname.
 
 -v, --verbose::
-	Also output details about the matching pattern (if any)
-	for each given pathname. For precedence rules within and
-	between exclude sources, see linkgit:gitignore[5].
+	Instead of printing the paths that are excluded, for each path
+	that matches an exclude pattern, print the exclude pattern
+	together with the path.  (Matching an exclude pattern usually
+	means the path is excluded, but if the pattern begins with '!'
+	then it is a negated pattern and matching it means the path is
+	NOT excluded.)
++
+For precedence rules within and between exclude sources, see
+linkgit:gitignore[5].
 
 --stdin::
 	Read pathnames from the standard input, one per line,
 	instead of from the command-line.
 
 -z::
-	The output format is modified to be machine-parseable (see
+	The output format is modified to be machine-parsable (see
 	below).  If `--stdin` is also given, input paths are separated
 	with a NUL character instead of a linefeed character.