Update react-navigation.mdx (#11634)

Author: ethanneff

docs/platforms/react-native/tracing/instrumentation/react-navigation.mdx

@@ -17,7 +17,7 @@ The code snippet below shows how to initialize the instrumentation.
 You can configure the instrumentation by passing an options object to the constructor:
 
 ```javascript
-Sentry.reactNavigationintegration({
+Sentry.reactNavigationIntegration({
   enableTimeToInitialDisplay: true, // default: false
   routeChangeTimeoutMs: 1_000, // default: 1_000
   ignoreEmptyBackNavigationTransactions: true, // default: true