docs: fix broken "rate limiting" link

[cwaldren-ld]

Updates dead link in README.

[cwaldren-ld]

I don't know how our generated docs work - do those come from this repo? The link works there, but not on the Github README.

Perhaps merging this would then break the generated docs?

[lucywyman]

Oh this is actually generated from this doc I believe: https://github.com/launchdarkly/gonfalon/blob/main/apidocs/content/overview.md?plain=1#L243 Can you update it there?

[lucywyman]

I don't know how our generated docs work - do those come from this repo? The link works there, but not on the Github README.

Perhaps merging this would then break the generated docs?

Oh dang, I thought that this would still work for the generated docs but it does not :( Hmm....

[cwaldren-ld]

Another idea: we could just delete the link, since the linked section is like 1 inch below the table. Unsatisfying though.