[PATCH] doc/config: mark ssh allowedSigners example as literal

The discussion for gpg.ssh.allowedSignersFile shows an example string
that contains "user1@example.com,user2@example.com". Asciidoc thinks
these are real email addresses and generates "mailto" footnotes for
them. This makes the rendered content more confusing, as it has extra
"[1]" markers:

  The file consists of one or more lines of principals followed by an
  ssh public key. e.g.: user1@example.com[1],user2@example.com[2]
  ssh-rsa AAAAX1... See ssh-keygen(1) "ALLOWED SIGNERS" for details.

and also generates pointless notes at the end of the page:

  NOTES
        1. user1@example.com
           mailto:user1@example.com

        2. user2@example.com
           mailto:user2@example.com

We can fix this by putting the example into a backtick literal block.
That inhibits the mailto generation, and as a bonus typesets the example
text in a way that sets it off from the regular prose (a tt font for
html, or bold in the roff manpage).

Signed-off-by: Jeff King <redacted>
---
Possibly this could actually be done in a separate example block, but I
think this looks OK and fixes the most obvious problem.

 Documentation/config/gpg.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/config/gpg.txt b/Documentation/config/gpg.txt
index 4f30c7dbdd..7875f4fccc 100644
--- a/Documentation/config/gpg.txt
+++ b/Documentation/config/gpg.txt

@@ -44,7 +44,7 @@ gpg.ssh.allowedSignersFile::
 	A file containing ssh public keys which you are willing to trust.
 	The file consists of one or more lines of principals followed by an ssh
 	public key.
-	e.g.: user1@example.com,user2@example.com ssh-rsa AAAAX1...
+	e.g.: `user1@example.com,user2@example.com ssh-rsa AAAAX1...`
 	See ssh-keygen(1) "ALLOWED SIGNERS" for details.
 	The principal is only used to identify the key and is available when
 	verifying a signature.

-- 
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