message: docs: add missing commas
  nitpicking
diff: @@ -172,7 +172,7 @@ Jest can be used in projects that use [webpack](https://webpack.github.io/) to m
  ### Using TypeScript
  -Jest supports TypeScript, via Babel. First make sure you followed the instructions on [using Babel](#using-babel) above. Next install the `@babel/preset-typescript` via `yarn`:
  +Jest supports TypeScript, via Babel. First, make sure you followed the instructions on [using Babel](#using-babel) above. Next, install the `@babel/preset-typescript` via `yarn`:
  ```bash
  yarn add --dev @babel/preset-typescript
  