Fix typo (#22904)

docs/page.js

@@ -2,7 +2,7 @@ if ( ! window.frameElement && window.location.protocol !== 'file:' ) {
 
 	// If the page is not yet displayed as an iframe of the index page (navigation panel/working links),
 	// redirect to the index page (using the current URL without extension as the new fragment).
-	// If this URL itself has a fragment, append it with a dot (since '#' in an URL fragment is not allowed).
+	// If this URL itself has a fragment, append it with a dot (since '#' in a URL fragment is not allowed).
 
 	let href = window.location.href;
 	const splitIndex = href.lastIndexOf( '/docs/' ) + 6;