[MERGE] Explain --message and --mail-to in the help of merge-directive

[Aaron Bentley]

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James Westby wrote:
> +
> +    If the --message option is used then the specified message will be used
> +    as the commit message when the merge is performed.
> +
> +    --mail-to can be used to send the merge directive directly to the
> +    recipient. If a message is supplied with --message then it will be used
> +    as the subject of the mail.

This seems to basically repeat the option help.  And since no one should
be using these options, I hesitate to give them prominence.

Aaron
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