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

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+Customizing the content and formatting of emails
+================================================
+
+Overloading template strings
+----------------------------
+
+The content of emails is generated based on template strings defined
+in ``git_multimail.py``. You can customize these template strings
+without changing the script itself, by defining a Python wrapper
+around it. The python wrapper should ``import git_multimail`` and then
+override the ``git_multimail.*`` strings like this::
+
+  import sys  # needed for sys.argv
+
+  # Import and customize git_multimail:
+  import git_multimail
+  git_multimail.REVISION_INTRO_TEMPLATE = """..."""
+  git_multimail.COMBINED_INTRO_TEMPLATE = git_multimail.REVISION_INTRO_TEMPLATE
+
+  # start git_multimail itself:
+  git_multimail.main(sys.argv[1:])
+
+The template strings can use any value already used in the existing
+templates (read the source code).
+
+Using HTML in template strings
+------------------------------
+
+If ``multimailhook.commitEmailFormat`` is set to HTML, then
+git-multimail will generate HTML emails for commit notifications. The
+log and diff will be formatted automatically by git-multimail. By
+default, any HTML special character in the templates will be escaped.
+
+To use HTML formatting in the introduction of the email, set
+``multimailhook.htmlInIntro`` to ``true``. Then, the template can
+contain any HTML tags, that will be sent as-is in the email. For
+example, to add some formatting and a link to the online commit, use
+a format like::
+
+  git_multimail.REVISION_INTRO_TEMPLATE = """\
+  <span style="color:#808080">This is an automated email from the git hooks/post-receive script.</span><br /><br />
+
+  <strong>%(pusher)s</strong> pushed a commit to %(refname_type)s %(short_refname)s
+  in repository %(repo_shortname)s.<br />
+
+  <a href="https://github.com/git-multimail/git-multimail/commit/%(newrev)s">View on GitHub</a>.
+  """
+
+Note that the values expanded from ``%(variable)s`` in the format
+strings will still be escaped.
+
+For a less flexible but easier to set up way to add a link to commit
+emails, see ``multimailhook.commitBrowseURL``.
+
+Similarly, one can set ``multimailhook.htmlInFooter`` and override any
+of the ``*_FOOTER*`` template strings.