doc/rev-list-options: clarify "commit@{Nth}" for "-g" option

When "log -g" shows "HEAD@{1}", "HEAD@{2}", etc, calling
that "commit@{Nth}" is not really accurate. The "HEAD" part
is really the refname. By saying "commit", a reader may
misunderstand that to mean something related to the specific
commit we are showing, not the ref whose reflog we are
traversing.

While we're here, let's also switch these instances to use
literal backticks, as our style guide recommends. As a
bonus, that lets us drop some asciidoc quoting.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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