chore: fix indentation (#432)

Author: ehmicky

docs/guidelines.md

@@ -13,13 +13,13 @@ Plugins with required `inputs` cannot be installed via the Netlify UI. Wherever
 Every plugin in the Netlify plugins directory includes a link to the plugin README. This file should include:
 
 - A description of what the plugin does and why that might be useful.
-- UI-based installation instructions. 
+- UI-based installation instructions.
   > **Note:** You can include UI-based installation instructions in a separate, follow-up pull request. The PR will be merged when your plugin is approved for inclusion in the plugins directory.
-    - Include a direct installation link using the format `https://app.netlify.com/plugins/{plugin-package-name}/install`.
-    - Point to the [plugins directory](https://app.netlify.com/plugins) in the Netlify UI.
+  - Include a direct installation link using the format `https://app.netlify.com/plugins/{plugin-package-name}/install`.
+  - Point to the [plugins directory](https://app.netlify.com/plugins) in the Netlify UI.
 - File-based installation instructions. Visit our [Next.js Build Plugin README](https://github.com/netlify/netlify-plugin-nextjs/blob/main/README.md) for an example.
-    - Include sample code for declaring the plugin in the `netlify.toml` configuration file.
-    - Include a step instructing developers to use npm, yarn, or another Node.js package manager to add the plugin to `devDependencies` in the base directory's `package.json`.
+  - Include sample code for declaring the plugin in the `netlify.toml` configuration file.
+  - Include a step instructing developers to use npm, yarn, or another Node.js package manager to add the plugin to `devDependencies` in the base directory's `package.json`.
 - Any required environment variables.
 - Details regarding any optional environment variables or `inputs`.
 - Ideally, a link to a demo site with [public deploy logs](https://docs.netlify.com/configure-builds/get-started/#basic-build-settings) and a [Deploy to Netlify button](https://docs.netlify.com/site-deploys/create-deploys/#deploy-to-netlify-button), so users can find out how the plugin works before installing.