Added beam documentation

__tests__/__snapshots__/documentation.js.snap

@@ -319,6 +319,7 @@ Array [
   "platforms/python/aiohttp/index.html",
   "platforms/python/asgi/index.html",
   "platforms/python/aws_lambda/index.html",
+  "platforms/python/beam/index.html",
   "platforms/python/bottle/index.html",
   "platforms/python/celery/index.html",
   "platforms/python/default-integrations/index.html",

src/collections/_documentation/platforms/python/beam.md

@@ -0,0 +1,21 @@
+---
+title: Apache Beam
+sidebar_order: 2
+---
+<!-- WIZARD -->
+The Beam integration currently parses the functions in [ParDo](https://github.com/apache/beam/blob/release-2.13.0/sdks/python/apache_beam/transforms/core.py#L991) to return exceptions in their respective setup, start_bundle, process, and finish_bundle functions.
+
+The functions get injected with an inspect function to patch getting the [function signature](https://github.com/apache/beam/blob/release-2.13.0/sdks/python/apache_beam/transforms/core.py#L288L298).
+
+**This integration is experimental.** It may be removed in minor versions. When enabling this integration, expect to see incorrect server_name and ip due to some distributed within Beam.
+
+Add ``BeamIntegration()`` to your ``integrations`` list:
+
+```python
+import sentry_sdk
+from sentry_sdk.integrations.beam import BeamIntegration
+
+sentry_sdk.init("___PUBLIC_DSN___", integrations=[BeamIntegration()])
+```
+
+<!-- ENDWIZARD -->