fix(feedback): Fix sendFeedback docs (#8962)

* fix(feedback): Fix `sendFeedback` docs

Unfortunately, this code never worked -- we have instead, exported the `sendFeedback` function from the browser SDK packages.

* [getsentry/action-github-commit] Auto commit

---------

Co-authored-by: getsantry[bot] <66042841+getsantry[bot]@users.noreply.github.com>

Author: billyvg

src/platforms/javascript/common/user-feedback/configuration/index.mdx

@@ -201,7 +201,7 @@ You can also use your own UI components to gather feedback and pass the feedback
 - an optional "options" object
 
 ```javascript
-sendFeedback(
+Sentry.sendFeedback(
   {
     name: "Jane Doe", // optional
     email: "email@example.org", // optional
@@ -224,14 +224,15 @@ Here is a simple example:
 ```
 
 ```javascript
-import { BrowserClient, Feedback,  getClient } from '@sentry/react';
-
-document.getElementById('my-feedback-form').addEventListener('submit', (event) => {
-  const feedback = getClient<BrowserClient>()?.getIntegration(Feedback);
-  const formData = new FormData(event.currentTarget);
-  feedback.sendFeedback(formData);
-  event.preventDefault();
-});
+import { sendFeedback } from "@sentry/react";
+
+document
+  .getElementById("my-feedback-form")
+  .addEventListener("submit", (event) => {
+    const formData = new FormData(event.currentTarget);
+    sendFeedback(formData);
+    event.preventDefault();
+  });
 ```
 
 </PlatformSection>