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

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

third_party/git/Documentation/git-unpack-objects.txt

@@ -0,0 +1,52 @@
+git-unpack-objects(1)
+=====================
+
+NAME
+----
+git-unpack-objects - Unpack objects from a packed archive
+
+
+SYNOPSIS
+--------
+[verse]
+'git unpack-objects' [-n] [-q] [-r] [--strict]
+
+
+DESCRIPTION
+-----------
+Read a packed archive (.pack) from the standard input, expanding
+the objects contained within and writing them into the repository in
+"loose" (one object per file) format.
+
+Objects that already exist in the repository will *not* be unpacked
+from the packfile.  Therefore, nothing will be unpacked if you use
+this command on a packfile that exists within the target repository.
+
+See linkgit:git-repack[1] for options to generate
+new packs and replace existing ones.
+
+OPTIONS
+-------
+-n::
+        Dry run.  Check the pack file without actually unpacking
+	the objects.
+
+-q::
+	The command usually shows percentage progress.  This
+	flag suppresses it.
+
+-r::
+	When unpacking a corrupt packfile, the command dies at
+	the first corruption.  This flag tells it to keep going
+	and make the best effort to recover as many objects as
+	possible.
+
+--strict::
+	Don't write objects with broken content or links.
+
+--max-input-size=<size>::
+	Die, if the pack is larger than <size>.
+
+GIT
+---
+Part of the linkgit:git[1] suite