feat(replay): Add note about potential Angular performance impact (#6267)

* feat(replay): Add note about potential Angular performance impact

* Update src/platforms/javascript/common/session-replay/index.mdx

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

* angular only

---------

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

Author: billyvg

src/platforms/javascript/common/session-replay/index.mdx

@@ -31,6 +31,12 @@ By default, it'll mask all fields, so no personally identifiable information (PI
 
 <PlatformContent includePath="session-replay/pre-requisites" />
 
+<PlatformSection supported={["javascript.angular"]}>
+<Alert level="warning" title="Warning">
+We’re investigating possible performance degradation in <b>some</b> Angular applications. We recommend testing your application before releasing. Please reach out via <a href="https://github.com/getsentry/sentry-javascript/issues/6946">this GitHub ticket</a> if you have issues.
+</Alert>
+</PlatformSection>
+
 ## Install
 
 <PlatformContent includePath="session-replay/install" />