fix: mark --rulesdir option as deprecated in CLI docs

[platinumazure]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[x] Other, please explain: Update docs and CLI option guide to note that --rulesdir is deprecated. (It has been considered deprecated for some time but these docs were missing that info.)

What changes did you make? (Give an overview)

Update docs and CLI option guide to note that --rulesdir is deprecated. (It has been considered deprecated for some time but these docs were missing that info.)

This is effectively a docs change, but commit is tagged as fix: due to changing code. The code change is just to reorder options (moving deprecated option to bottom of category) and adding deprecation note to help string.

Is there anything you'd like reviewers to focus on?

Any concerns with reordering the options?

Can the CLI help string changes be improved, to maximize both readability and brevity?

[linux-foundation-easycla]

• ❌ The commit (5f89f47) is missing the User's ID, preventing the EasyCLA check. Consult GitHub Help to resolve.For further assistance with EasyCLA, please submit a support request ticket.

[platinumazure]

Created a new gpg key and had some trouble with getting EasyCLA and GitHub commit verification to pass. Should be good now, but please let me know if anything looks suspicious.

[nzakas]

Just a bit of cleanup needed.