chore(weave): Document feedback feature with call UUID examples

[bdytx5]

Summary Adds documentation for the feedback feature. Includes examples for retrieving call UUIDs in code

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/approve bfa6a73d1e968ad40c739a5ff4d555bc81cfc2f3

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[bdytx5]

I have read the CLA Document and I hereby sign the CLA

[jamie-rasmussen]

recheck

[jamie-rasmussen]

CLA check isn't working, will close this in favor of copy at https://github.com/wandb/weave/pull/2178 as a workaround.