docs/style: permit inline loop variables

I've already wasted enough of my time debugging aliased variables in
deeply nested loops. While not scattering variable declarations around
is a good aim I think we can make an exception for stuff used inside a
loop.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230829161528.2707696-5-alex.bennee@linaro.org>

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