[Docs] Improve finnish rule documentation

Context:

Hello! In my project, I use this configuration:

rxjs/finnish:
  - warn
  - functions: true
    methods: true
    names:
      ^canActivate$: false
      ^canActivateChild$: false
      ^canDeactivate$: false
      ^canLoad$: false
      ^intercept$: false
      ^resolve$: false
      ^validate$: false
      ^transform$: false
    parameters: true
    properties: true
    strict: true # Culprit
    types:
      ^EventEmitter$: false
      ^Store$: false
      ^Actions$: false
    variables: true

The types white-list was not working due to strict at true.
Using it to false fixed my issue.

I have struggled to understand from the documentation what is the difference between using this option at false or at true.

Suggestion:

Could you add more details regarding this option in the documentation? Thanks!

Link: https://github.com/cartant/eslint-plugin-rxjs/blob/main/docs/rules/finnish.md

[cartant]

Actually, I’ll remove the negatives to make things simpler:

… a strict property that, if true, allows the $ suffix to be used only with identifiers that have an Observable type.

Of course, I still think this is likely to be a bug.

[cartant]

No worries.