docs/devel: document some plugin assumptions

While we attempt to hide implementation details from the plugin we
shouldn't be totally obtuse. Let the user know what they can and can't
expect with the various instrumentation options.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240227144335.1196131-29-alex.bennee@linaro.org>
1 file changed