doc: interpret-trailers: fix example

We need to provide `--trailer sign` since the command won’t output
anything if you don’t give it an input and/or a
`--trailer`. Furthermore, the message which already contains an s-o-b is
wrong:

    $ git interpret-trailers --trailer sign <msg.txt
    Signed-off-by: Alice <[email protected]>

    Signed-off-by: Alice <[email protected]>

This can’t be what was originally intended.

So change the messages in this example to use the typical
“subject/message” file.

Signed-off-by: Kristoffer Haugsbakk <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: LemmingAvalanche

Documentation/git-interpret-trailers.txt

@@ -322,16 +322,30 @@ $ git interpret-trailers --trailer 'Cc: Alice <[email protected]>' --trailer 'Re
   'Signed-off-by: ' already, and show how it works:
 +
 ------------
+$ cat msg1.txt
+subject
+
+message
 $ git config trailer.sign.key "Signed-off-by: "
 $ git config trailer.sign.ifmissing add
 $ git config trailer.sign.ifexists doNothing
 $ git config trailer.sign.cmd 'echo "$(git config user.name) <$(git config user.email)>"'
-$ git interpret-trailers </dev/null
+$ git interpret-trailers --trailer sign <msg1.txt
+subject
+
+message
 
 Signed-off-by: Bob <[email protected]>
-$ cat msg.txt
+$ cat msg2.txt
+subject
+
+message
+
 Signed-off-by: Alice <[email protected]>
-$ git interpret-trailers <msg.txt
+$ git interpret-trailers --trailer sign <msg2.txt
+subject
+
+message
 
 Signed-off-by: Alice <[email protected]>
 ------------