DOC Document linting documentation

en/05_Contributing/02_Documentation.md

@@ -72,6 +72,26 @@ Once you've made the pull request, make sure the pull request follows the guidel
 
 If you prefer to edit content on your local machine, follow the instructions on the [contributing code](code) page, since editing documentation on your computer follows that same process.
 
+### Linting locally
+
+When you submit your pull request, the documentation will be automatically linted. You may want to run this process locally. To do so, you'll need to have both [Composer](https://getcomposer.org/download/) and Yarn installed. See [client-side build tooling](/contributing/build_tooling/#installation) for yarn installation instructions.
+
+You can then run the following commands from the command line to lint the documentation:
+
+```bash
+yarn install
+composer install
+yarn lint
+```
+
+If there are linting issues, you may find the output easier to work with by running the separate types of linting individually. You can find the commands for those inside the `package.json` file.
+
+You can also fix any automatically fixable problems by passing the `--fix` option to the lint command.
+
+```bash
+yarn lint --fix
+```
+
 ## Writing style
 
 - Write in second person form, addressing the reader. For example "First you'll install a webserver" is good style.