chore: Add profilesSampler in migration docs (#15253)

Author: c298lee

docs/migration/v8-to-v9.md

@@ -361,7 +361,7 @@ This should not affect most users unless you relied on passing things with a sim
 - The `Request` type has been removed. Use `RequestEventData` type instead.
 - The `IntegrationClass` type is no longer exported - it was not used anymore. Instead, use `Integration` or `IntegrationFn`.
 - The `samplingContext.request` attribute in the `tracesSampler` has been removed. Use `samplingContext.normalizedRequest` instead. Note that the type of `normalizedRequest` differs from `request`.
-- The `samplingContext.transactionContext` object in the `tracesSampler` has been removed. All object attributes are available in the top-level of `samplingContext`.
+- The `samplingContext.transactionContext` object in the `tracesSampler` and `profilesSampler` has been removed. All object attributes are available in the top-level of `samplingContext`.
 - `Client` now always expects the `BaseClient` class - there is no more abstract `Client` that can be implemented! Any `Client` class has to extend from `BaseClient`.
 - `ReportDialogOptions` now extends `Record<string, unknown>` instead of `Record<string, any>` - this should not affect most users.
 - The `RequestDataIntegrationOptions` type has been removed. There is no replacement.