docs: fix duplicate words in documentation

Remove duplicate words in two documentation files:
- 'the the' -> 'the' in react-performance-tracks.md
- 'can can' -> 'can' in createRoot.md

Author: seojcarlos

src/content/reference/dev-tools/react-performance-tracks.md

@@ -140,7 +140,7 @@ In development builds, when you click on a component render entry, you can inspe
 
 The Server Requests track visualized all Promises that eventually end up in a React Server Component. This includes any `async` operations like calling `fetch` or async Node.js file operations. 
 
-React will try to combine Promises that are started from inside third-party code into a single span representing the the duration of the entire operation blocking 1st party code.
+React will try to combine Promises that are started from inside third-party code into a single span representing the duration of the entire operation blocking 1st party code.
 For example, a third party library method called `getUser` that calls `fetch` internally multiple times will be represented as a single span called `getUser`, instead of showing multiple `fetch` spans.
 
 Clicking on spans will show you a stack trace of where the Promise was created as well as a view of the value that the Promise resolved to, if available.

src/content/reference/react-dom/client/createRoot.md

@@ -379,7 +379,7 @@ The <CodeStep step={1}>onCaughtError</CodeStep> option is a function called with
 1. The <CodeStep step={2}>error</CodeStep> that was thrown.
 2. An <CodeStep step={3}>errorInfo</CodeStep> object that contains the <CodeStep step={4}>componentStack</CodeStep> of the error.
 
-Together with `onUncaughtError` and `onRecoverableError`, you can can implement your own error reporting system:
+Together with `onUncaughtError` and `onRecoverableError`, you can implement your own error reporting system:
 
 <Sandpack>