merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

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diff --git a/third_party/git/Documentation/git-mailinfo.txt b/third_party/git/Documentation/git-mailinfo.txt
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+git-mailinfo(1)
+===============
+
+NAME
+----
+git-mailinfo - Extracts patch and authorship from a single e-mail message
+
+
+SYNOPSIS
+--------
+[verse]
+'git mailinfo' [-k|-b] [-u | --encoding=<encoding> | -n] [--[no-]scissors] <msg> <patch>
+
+
+DESCRIPTION
+-----------
+Reads a single e-mail message from the standard input, and
+writes the commit log message in <msg> file, and the patches in
+<patch> file.  The author name, e-mail and e-mail subject are
+written out to the standard output to be used by 'git am'
+to create a commit.  It is usually not necessary to use this
+command directly.  See linkgit:git-am[1] instead.
+
+
+OPTIONS
+-------
+-k::
+	Usually the program removes email cruft from the Subject:
+	header line to extract the title line for the commit log
+	message.  This option prevents this munging, and is most
+	useful when used to read back 'git format-patch -k' output.
++
+Specifically, the following are removed until none of them remain:
++
+--
+*	Leading and trailing whitespace.
+
+*	Leading `Re:`, `re:`, and `:`.
+
+*	Leading bracketed strings (between `[` and `]`, usually
+	`[PATCH]`).
+--
++
+Finally, runs of whitespace are normalized to a single ASCII space
+character.
+
+-b::
+	When -k is not in effect, all leading strings bracketed with '['
+	and ']' pairs are stripped.  This option limits the stripping to
+	only the pairs whose bracketed string contains the word "PATCH".
+
+-u::
+	The commit log message, author name and author email are
+	taken from the e-mail, and after minimally decoding MIME
+	transfer encoding, re-coded in the charset specified by
+	i18n.commitencoding (defaulting to UTF-8) by transliterating
+	them.  This used to be optional but now it is the default.
++
+Note that the patch is always used as-is without charset
+conversion, even with this flag.
+
+--encoding=<encoding>::
+	Similar to -u.  But when re-coding, the charset specified here is
+	used instead of the one specified by i18n.commitencoding or UTF-8.
+
+-n::
+	Disable all charset re-coding of the metadata.
+
+-m::
+--message-id::
+	Copy the Message-ID header at the end of the commit message.  This
+	is useful in order to associate commits with mailing list discussions.
+
+--scissors::
+	Remove everything in body before a scissors line.  A line that
+	mainly consists of scissors (either ">8" or "8<") and perforation
+	(dash "-") marks is called a scissors line, and is used to request
+	the reader to cut the message at that line.  If such a line
+	appears in the body of the message before the patch, everything
+	before it (including the scissors line itself) is ignored when
+	this option is used.
++
+This is useful if you want to begin your message in a discussion thread
+with comments and suggestions on the message you are responding to, and to
+conclude it with a patch submission, separating the discussion and the
+beginning of the proposed commit log message with a scissors line.
++
+This can be enabled by default with the configuration option mailinfo.scissors.
+
+--no-scissors::
+	Ignore scissors lines. Useful for overriding mailinfo.scissors settings.
+
+<msg>::
+	The commit log message extracted from e-mail, usually
+	except the title line which comes from e-mail Subject.
+
+<patch>::
+	The patch extracted from e-mail.
+
+GIT
+---
+Part of the linkgit:git[1] suite