feat(js): Update JS troubleshooting for new v7 client (#5342)

Update instructions for client constructor in docs.

Author: AbhiPrasad

src/platforms/javascript/common/troubleshooting/index.mdx

@@ -266,10 +266,13 @@ This also helps to prevent tracking of any parent application errors in case you
 inside of it. In this example we use `@sentry/browser` but it's also applicable to `@sentry/node`.
 
 ```javascript
-import { BrowserClient } from "@sentry/browser";
+import { BrowserClient, defaultStackParser, defaultIntegrations, makeFetchTransport } from "@sentry/browser";
 
 const client = new BrowserClient({
   dsn: "___PUBLIC_DSN___",
+  transport: makeFetchTransport,
+  stackParser: defaultStackParser,
+  integrations: defaultIntegrations,
 });
 
 client.captureException(new Error("example"));
@@ -278,10 +281,13 @@ client.captureException(new Error("example"));
 While the above sample should work perfectly fine, some methods like `configureScope` and `withScope` are missing on the `Client` because the `Hub` takes care of the state management. That's why it may be easier to create a new `Hub` and bind your `Client` to it. The result is the same but you will also get state management with it.
 
 ```javascript
-import { BrowserClient, Hub } from "@sentry/browser";
+import { BrowserClient, defaultStackParser, defaultIntegrations, makeFetchTransport } from "@sentry/browser";
 
 const client = new BrowserClient({
   dsn: "___PUBLIC_DSN___",
+  transport: makeFetchTransport,
+  stackParser: defaultStackParser,
+  integrations: defaultIntegrations,
 });
 
 const hub = new Hub(client);
@@ -335,6 +341,8 @@ HappyIntegration.id = "HappyIntegration";
 
 const client1 = new Sentry.BrowserClient({
   dsn: "___PUBLIC_DSN___",
+  transport: Sentry.makeFetchTransport,
+  stackParser: Sentry.defaultStackParser,
   integrations: [...Sentry.defaultIntegrations, new HappyIntegration()],
   beforeSend(event) {
     console.log("client 1", event);
@@ -345,6 +353,8 @@ const hub1 = new Sentry.Hub(client1);
 
 const client2 = new Sentry.BrowserClient({
   dsn: "___PUBLIC_DSN___", // Can be a different DSN
+  transport: Sentry.makeFetchTransport,
+  stackParser: Sentry.defaultStackParser,
   integrations: [...Sentry.defaultIntegrations, new HappyIntegration()],
   beforeSend(event) {
     console.log("client 2", event);