Update codepush.mdx

Author: krystofwoldrich

docs/platforms/react-native/sourcemaps/uploading/codepush.mdx

@@ -83,7 +83,7 @@ To associate the uploaded artifacts with the CodePush release, use the `--releas
 
 ### Using `codePush.getUpdateMetadata`
 
-Use `Sentry.setTag` to associate the CodePush Update Label with the captured events.
+If you rely on `codePush.getUpdateMetadata` to get the CodePush Update Label, use `Sentry.setTag` to associate the CodePush Update Label with the captured events. This will enable you to filter events in the Sentry UI based on the label. We discourage using `codePush.getUpdateMetadata` to initialize the SDK as it delays the initialization and errors before the CodePush Update Label is available won't be reported to Sentry.
 
 ```javascript
 codePush.getUpdateMetadata().then((update) => {