doc: format-rev: quote subject placeholder before and after

We first talk about just `%s`, but then show the result with
quotes. That is inconsistent. Let’s use quotes both in the format
as well as in the result.

The implied input here, which is not spelled out for brevity, is:

    Did we not fix this in <commit object name>?

Which is then supposed to be formatted to `"<subject>"`.

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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