docs: fix incorrect version comment in changelog (#10711)

changelog_unreleased/typescript/10418.md

@@ -7,10 +7,10 @@
 // Input
 type T = abstract new () => void;
 
-// Prettier main
+// Prettier stable
 SyntaxError: Unexpected token, expected ";" (1:19)
 
-// Prettier stable
+// Prettier main
 type T = abstract new () => void;
 
 ```
@@ -22,10 +22,10 @@ type T = abstract new () => void;
 // Input
 import type A = require("A");
 
-// Prettier main
+// Prettier stable
 SyntaxError: Only ECMAScript imports may use 'import type'.
 
-// Prettier stable
+// Prettier main
 import type A = require("A");
 
 ```