docs(python): Clarify how to init SDK in async app (#12854)

Author: szokeasaurusrex

docs/platforms/python/integrations/asyncio/index.mdx

@@ -13,12 +13,13 @@ pip install --upgrade 'sentry-sdk'
 
 ## Configure
 
-Add `AsyncioIntegration()` to your list of `integrations`, enable tracing and be sure to call `sentry_sdk.init()` at the beginning of your async loop:
+Add `AsyncioIntegration()` to your list of `integrations`, enable tracing and be sure to call `sentry_sdk.init()` **at the beginning of the first `async` function you call**, as shown in the example below.
 
+<Alert level="warning">
 
-In addition to capturing errors, you can monitor interactions between multiple services or applications by [enabling tracing](/concepts/key-terms/tracing/). You can also collect and analyze performance profiles from real users with [profiling](/product/explore/profiling/).
+If you call `sentry_sdk.init()` outside of an `async` function in an async application, the SDK will not behave as expected.
 
-Select which Sentry features you'd like to install in addition to Error Monitoring to get the corresponding installation and configuration instructions below.
+</Alert>
 
 <OnboardingOptionButtons
   options={[