[apex] Updated the docs for UnusedMethod as per discussion #5200 #5354
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Describe the PR
Updated the documentation for the Apex > Design > UnusedMethod rule in conjunction with this discussion around a nuance with apex-link and not finding methods in 'empty' classes unless there's a variable declaration or other method present/called.
Related issues
As above, relates to findings from discussion #5200 which was causing some unknown behaviour with the rule not firing as expected. Doesn't fix #5200 but makes it clearer in the documentation.
Ready?
./mvnw clean verify
passes (checked automatically by github actions)