docs(python): Document how to migrate Hub clones

[szokeasaurusrex]

DESCRIBE YOUR PR

Document that Hub clones should be replaced with isolation scope forks. Depends on #10521.

Resolves #10524

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 2, 2024 11:37am

[codecov]

Bundle Report

Changes will increase total bundle size by 4 bytes ⬆️

Bundle name	Size	Change
sentry-docs-server	7.55MB	0 bytes
sentry-docs-edge-server	479.84kB	0 bytes
sentry-docs-client	6.22MB	4 bytes ⬆️

[vivianyentran]

Thanks for updating!