Note about fix rules in docs

[SpainTrain]

Add note about fix rules to docs

Related #4766 #4767

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[eslintbot]

@SpainTrain Thanks for the issue! If you're reporting a bug, please be sure to include:

1. The version of ESLint you are using (run eslint -v)
2. What you did (the source code and ESLint configuration)
3. The actual ESLint output complete with numbers
4. What you expected to happen instead

Requesting a new rule? Please see Proposing a New Rule for instructions.

[nzakas]

Can you explain what you have in mind? (We really need more than a short phrase in issue descriptions to decide if we want agree or not.)

[SpainTrain]

Apologies, this was just created because I wanted to open a PR and a "fixes" issue is required. I will be more descriptive in these in the future even if it is just for a PR.

[nzakas]

Thanks! What we'd like is for an issue that describes a problem, and then submit a PR that has the solution. That way, if we don't like the solution, we can close the PR and try another one, all the while the issue remains open as a clear description of the problem.

[BYK]

@nzakas I know this wasn't accepted yet but I wanted to give this one-sentence patch a shot to see if it'd address @SpainTrain's concern.