fix: Missing closing ``` in redux section on react page (#1915)

Author: jennmueng

src/collections/_documentation/platforms/javascript/react.md

@@ -213,6 +213,7 @@ Sentry.init({
   dsn: '___DSN___',
   normalizeDepth: 10 // Or however deep you want your state context to be.
 })
+```
 
 ### Redux Enhancer Options