Add note+link about multiple APM tools to platforms page (#11768)

Author: kahest

docs/platforms/index.mdx

@@ -16,6 +16,8 @@ It's considered bad practice to use Sentry SDKs in third-party plugins, packages
 - [Signal handlers](https://en.wikipedia.org/wiki/C_signal_handling) may overwrite each other, leading to one of the Sentry SDKs operating incorrectly.
 - Third-party SDKs and libraries may leak users' PII data to the third-party's Sentry organization.
 
+We also <Link to="https://sentry.zendesk.com/hc/en-us/articles/23961784367387">discourage using Sentry alongside other APM tools</Link> because it can lead to a number of side-effects that negatively impact performance and stability of the application.
+
 </Note>
 
 ## Platforms