[Pack][RecordedFutureV3] Update integration readme: add link to migration guide.

[recordedfuture-dev]

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[YaelShamai]

Hey,
Looks fine, we do need to update the pack version and add a release note. write something like: Improved documentation.

[YaelShamai]

Never mind, there is no need for release notes.

[github-actions]

Thank you for your contribution. Your external PR has been merged and the changes are now included in an internal PR for further review. The internal PR will be merged to the master branch within 3 business days.