chore: Update typegen example

examples/using-graphql-typegen/README.md

@@ -2,4 +2,18 @@
 
 Example project for the documentation page [GraphQL Typegen](https://gatsbyjs.com/docs/how-to/local-development/graphql-typegen).
 
-Run `npm install` and `npm run develop` to get started. If you have VSCode installed with the [GraphQL extension](https://marketplace.visualstudio.com/items?itemName=GraphQL.vscode-graphql) you can get autocompletion inside VSCode itself for an query. You can access the global namespace `Queries` to type your query responses.
+## Getting Started
+
+Install dependencies:
+
+```shell
+npm install --legacy-peer-deps
+```
+
+Run the development server:
+
+```shell
+npm run develop
+```
+
+Afterwards you'll see new files at `src/gatsby-types.d.ts` and inside the `.cache/typegen` folder. You can now also run ESLint (with `npm run lint`). If you have VSCode installed with the [GraphQL extension](https://marketplace.visualstudio.com/items?itemName=GraphQL.vscode-graphql) you can get autocompletion inside VSCode itself for an query (you'll need to run `gatsby develop` for this to work). You can access the global namespace `Queries` to type your query responses.

examples/using-graphql-typegen/graphql.config.js

@@ -1 +1,2 @@
+// You'll need to run 'gatsby develop' before this file exists
 module.exports = require("./.cache/typegen/graphql.config.json")