feat(flutter): Add note that Flutter Session Replay is only available on iOS and Android

[buenaflor]

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Name	Status	Preview	Comments	Updated (UTC)
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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **changelog** | ⬜️ Ignored ([Inspect](https://vercel.com/sentry/changelog/FNrp8joJbu2UGth19Qua3YFgwPjX)) | | | Nov 20, 2024 2:13pm | | **develop-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/sentry/develop-docs/C9R591CSJf8PMfNmekoSargBjTtc)) | | | Nov 20, 2024 2:13pm |

[codecov[bot]]

Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) :arrow_down:. This is within the configured threshold :white_check_mark:

Detailed changes

| Bundle name | Size | Change | | ----------- | ---- | ------ | | sentry-docs-server-cjs | 8.6MB | 9 bytes (-0.0%) :arrow_down: | | sentry-docs-client-array-push | 8.94MB | 6 bytes (-0.0%) :arrow_down: |