merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/Documentation/git-pack-redundant.txt

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+git-pack-redundant(1)
+=====================
+
+NAME
+----
+git-pack-redundant - Find redundant pack files
+
+
+SYNOPSIS
+--------
+[verse]
+'git pack-redundant' [ --verbose ] [ --alt-odb ] < --all | .pack filename ... >
+
+DESCRIPTION
+-----------
+This program computes which packs in your repository
+are redundant. The output is suitable for piping to
+`xargs rm` if you are in the root of the repository.
+
+'git pack-redundant' accepts a list of objects on standard input. Any objects
+given will be ignored when checking which packs are required. This makes the
+following command useful when wanting to remove packs which contain unreachable
+objects.
+
+git fsck --full --unreachable | cut -d ' ' -f3 | \
+git pack-redundant --all | xargs rm
+
+OPTIONS
+-------
+
+
+--all::
+	Processes all packs. Any filenames on the command line are ignored.
+
+--alt-odb::
+	Don't require objects present in packs from alternate object
+	directories to be present in local packs.
+
+--verbose::
+	Outputs some statistics to stderr. Has a small performance penalty.
+
+SEE ALSO
+--------
+linkgit:git-pack-objects[1]
+linkgit:git-repack[1]
+linkgit:git-prune-packed[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite