Docs: Mention no-unused-private-class-members in no-unused-vars docs

[JoshuaKGoldberg]

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Suggested Changes

Mentioned by @mrazauskas in Discord (https://discord.com/channels/1026804805894672454/1084238921677946992/1191427957558878328):

Reading documentation of @typescript-eslint/no-unused-vars one might have an impression that the rule is fully replacing TypeScript's noUnusedLocals. Perhaps it is worth mentioning that no-unused-private-class-members should be used as well to have all (?) what noUnusedLocals does? The advice is available here already (more visibility could be good idea): #4571 (comment)

Agreed. Let's update https://typescript-eslint.io/rules/no-unused-vars to also mention https://eslint.org/docs/latest/rules/no-unused-private-class-members.

Affected URL(s)

https://typescript-eslint.io/rules/no-unused-vars