Squashed 'third_party/git/' content from commit cb71568594

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diff --git a/Documentation/config/gpg.txt b/Documentation/config/gpg.txt
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+gpg.program::
+	Use this custom program instead of "`gpg`" found on `$PATH` when
+	making or verifying a PGP signature. The program must support the
+	same command-line interface as GPG, namely, to verify a detached
+	signature, "`gpg --verify $signature - <$file`" is run, and the
+	program is expected to signal a good signature by exiting with
+	code 0, and to generate an ASCII-armored detached signature, the
+	standard input of "`gpg -bsau $key`" is fed with the contents to be
+	signed, and the program is expected to send the result to its
+	standard output.
+
+gpg.format::
+	Specifies which key format to use when signing with `--gpg-sign`.
+	Default is "openpgp" and another possible value is "x509".
+
+gpg.<format>.program::
+	Use this to customize the program used for the signing format you
+	chose. (see `gpg.program` and `gpg.format`) `gpg.program` can still
+	be used as a legacy synonym for `gpg.openpgp.program`. The default
+	value for `gpg.x509.program` is "gpgsm".