docs: Update migration guide wording (#2987)

Author: sentrivana

MIGRATION_GUIDE.md

@@ -23,7 +23,7 @@ Looking to upgrade from Sentry SDK 1.x to 2.x? Here's a comprehensive list of wh
 - `sentry_sdk.tracing_utils.should_propagate_trace()` now takes a `Client` instead of a `Hub` as first parameter.
 - `sentry_sdk.utils.is_sentry_url()` now takes a `Client` instead of a `Hub` as first parameter.
 - `sentry_sdk.utils._get_contextvars` does not return a tuple with three values, but a tuple with two values. The `copy_context` was removed.
-- If you create a transaction manually and later mutate the transaction in a `configure_scope` block this does not work anymore. Here is a recipe on how to change your code to make it work:
+- You no longer have to use `configure_scope` to mutate a transaction. Instead, you simply get the current scope to mutate the transaction. Here is a recipe on how to change your code to make it work:
     Your existing implementation:
     ```python
     transaction = sentry_sdk.transaction(...)