Update index.md (#6622)

Fix the grammar in the documentation.

Author: drex44

src/content/reference/react/index.md

@@ -8,7 +8,7 @@ This section provides detailed reference documentation for working with React. F
 
 </Intro>
 
-Our The React reference documentation is broken down into functional subsections:
+The React reference documentation is broken down into functional subsections:
 
 ## React {/*react*/}