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

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 which we are still investigating.
+
+</Expandable>