docs: improvements based on suggestions

website/src/content/development/adding-typescript.mdx

@@ -55,12 +55,18 @@ By default, this is included in the TypeScript starter template `src/index.tsx`
 You can also include this in the `tsconfig.json` file in the `compilerOptions.types` field but we don't recommend
 to use that unless you are very familiar with the [implications of using the `types` field](https://www.typescriptlang.org/tsconfig#types).
 
-Additional adjustments to other config files is also required, in particular:
+Additional adjustments to other config files are also required, in particular:
 
 - `.prettierrc`: use the `typescript` parser.
 - `jest.test.config.js`: use the `@commercetools-frontend/jest-preset-mc-app/typescript` preset.
 - `jest.eslint.config.js`: include the file extensions `ts` and `tsx` in `moduleFileExtensions`, then `<rootDir>/**/*.ts` and `<rootDir>/**/*.tsx` in `testMatch`.
 
+<Info>
+
+The TypeScript setup is already preconfigured when using the TypeScript starter template. Consider this document as a reference to match your setup.
+
+</Info>
+
 # Migrate to TypeScript
 
 If you have an existing Custom Application project and would like to migrate it to TypeScript, you need to do the following: