Simplify contribution steps

Author: josevalim

README.md

@@ -452,11 +452,11 @@ For more details and configuration options, see the [Mermaid usage docs](https:/
 
 The easiest way to test changes to ExDoc is to locally rebuild the app and its own documentation:
 
-  1. Run `mix setup` to install all dependencies.
-  2. Run `mix build` to generate the docs. This is a custom alias that will build assets, recompile ExDoc, and output fresh docs into the `doc/` directory.
-  3. If working on the assets, you may wish to run the assets build script in watch mode: `npm run --prefix assets build:watch`.
-  4. Run `mix lint` to check if the Elixir and JavaScript files are properly formatted. You can run `mix fix` to let the JavaScript linter and Elixir formatter fix the code automatically before submitting your pull request.
-  5. Please do not add the files generated in the `formatters/` directory to your commits. These will be handled as necessary by the repository maintainers.
+  1. Run `mix setup` to install all dependencies
+  2. Run `mix build` to generate the docs and open up the generated `doc/index.html`
+  3. (optional) Run `npm run --prefix assets build:watch` if working on assets for automatic recompilation
+  4. Run `mix lint` to check linting and formatting (and `mix fix` to automatically fix it)
+  5. (important) Do not add the files in the `formatters/` directory to your commits, those will be handled by the maintainers
 
 See the README in the `assets/` directory for more information on working on the assets.