update page title and remove old notes (#5770)

* updated page title and removed old notes

* updated platformsidebar component

Author: imatwawana

src/components/platformSidebar.tsx

@@ -86,7 +86,7 @@ export const PlatformSidebar = ({
       <DynamicNav
         root={`/${pathRoot}/performance`}
         title="Performance Monitoring"
-        prependLinks={[[`/${pathRoot}/performance/`, "Set Up"]]}
+        prependLinks={[[`/${pathRoot}/performance/`, "Set Up Performance"]]}
         suppressMissing
         tree={tree}
       />

src/platforms/common/performance/index.mdx

@@ -1,5 +1,5 @@
 ---
-title: Set Up
+title: Set Up Performance
 sidebar_order: 4000
 supported:
   - javascript
@@ -35,22 +35,6 @@ redirect_from:
 
 <!-- Include in `notSupported` any SDK which enables tracing automatically -->
 
-<PlatformSection supported={["native"]}>
-
-<Note>
-
-Performance monitoring is still an experimental, work-in-progress feature, and its API may be unstable. It may also have bugs. Feedback is appreciated, and should be submitted as an issue in the repository linked on the right side of this page.
-
-</Note>
-
-</PlatformSection>
-
-<Note>
-
-If you’re on a legacy plan, you'll need to add transaction events to your [subscription](https://sentry.io/pricing/) to use performance monitoring.
-
-</Note>
-
 With [performance monitoring](/product/performance/), Sentry tracks your software performance, measuring metrics like throughput and latency, and displaying the impact of errors across multiple systems. Sentry captures distributed traces consisting of transactions and spans, which measure individual services and individual operations within those services. Learn more about our model in [Distributed Tracing](/product/sentry-basics/tracing/distributed-tracing/).
 
 <PlatformSection supported={["dotnet", "go", "java", "javascript.nextjs", "node", "php", "python", "ruby", "dart", "flutter", "rust", "native"]}>