fix(react): Add missing Sentry import to react guide (#13842)

Resolves: #13838

Author: andreiborza

docs/platforms/javascript/guides/react/index.mdx

@@ -48,11 +48,11 @@ import * as Sentry from "@sentry/react";
 
 Sentry.init({
   dsn: "___PUBLIC_DSN___",
-  
+
   // Adds request headers and IP for users, for more info visit:
   // https://docs.sentry.io/platforms/javascript/guides/react/configuration/options/#sendDefaultPii
   sendDefaultPii: true,
-  
+
   integrations: [
     // ___PRODUCT_OPTION_START___ performance
     // If you're using react router, use the integration for your react router version instead.
@@ -113,6 +113,7 @@ Integrate Sentry with these hooks and customize error handling:
 
 ```javascript
 import { createRoot } from "react-dom/client";
+import * as Sentry from '@sentry/react';
 
 const container = document.getElementById(“app”);
 const root = createRoot(container, {

platform-includes/capture-error/javascript.react.mdx

@@ -52,6 +52,7 @@ Starting with React 19, the `createRoot` and `hydrateRoot` methods from `react-d
 
 ```javascript
 import { createRoot } from "react-dom/client";
+import * as Sentry from '@sentry/react';
 
 const container = document.getElementById(“app”);
 const root = createRoot(container, {