chore(aws-lambda): Add troubleshooting section with known issue (#15414)

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---------

Co-authored-by: Lukas Stracke <[email protected]>

Author: andreiborza

docs/platforms/javascript/guides/aws-lambda/troubleshooting.mdx

@@ -0,0 +1,17 @@
+---
+title: Troubleshooting
+description: >-
+  If you need help solving issues with your Sentry JavaScript AWS Lambda SDK,
+  you can read the edge cases documented below.
+keywords:
+  - aws lambda
+  - missing event
+sidebar_order: 9000
+og_image: /og-images/platforms-javascript-common-troubleshooting.png
+---
+
+<Expandable permalink title="Events Missing Right After Lambda Coldstart">
+
+Events might be missing right after a Lambda function coldstart. This is a [known issue](https://github.com/getsentry/sentry-javascript/issues/18107) which we are still investigating. Events are sent for subsequent function invocations.
+
+</Expandable>