Document caching

[sezanzeb]

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Description

Here is an attempt to document at least the parameters I was trying to find more information about today. I'm still uncertain about the meaning of cacheMaxEntries, because understanding those options requires reading through a lot of the code. Please extend my proposal. Actually, I think I still don't understand anything at all. I wish all of the options were documented in the same quality as the other auth0 docs.

Checklist

• [ ] I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• [ ] All active GitHub checks for tests, formatting, and security are passing
• [ ] The correct base branch is being used, if not the default branch

this is just a documentation change, nothing of that is needed

[sezanzeb]

Oh, I have missed https://github.com/auth0/node-jwks-rsa/blob/master/EXAMPLES.md#caching, oops

You can close this if you want. I think I wouldn't haved brushed over the link to that file so quickly if it was DOCS.md instead.