message: chore(docs): Improve plugin example
diff: @@ -12,9 +12,12 @@ infrastructure needs - CI/CD, monitoring, auditing, and more.
  The following steps assume that you have
  [created a Backstage app](./create-an-app.md) and want to add an existing plugin
  -to it. We are using the
  +to it.
  +
  +We are using the
  [CircleCI](https://github.com/backstage/backstage/blob/master/plugins/circleci/README.md)
  -plugin in this example.
  +plugin in this example, which is designed to show CI/CD pipeline information attached
  +to an entity in the software catalog.
  1. Add the plugin's npm package to the repo:
  @@ -23,8 +26,8 @@ yarn workspace app add @backstage/plugin-circleci
  ```
  Note the plugin is added to the `app` package, rather than the root
  -package.json. Backstage Apps are set up as monorepos with
  -[yarn workspaces](https://classic.yarnpkg.com/en/docs/workspaces/). Since
  + `package.json`. Backstage Apps are set up as monorepos with
  + [Yarn workspaces](https://classic.yarnpkg.com/en/docs/workspaces/). Since
  CircleCI is a frontend UI plugin, it goes in `app` rather than `backend`.
  2. Add the `EntityCircleCIContent` extension to the entity pages in the app:
  @@ -48,11 +51,15 @@ CircleCI is a frontend UI plugin, it goes in `app` rather than `backend`.
  ```
  This is just one example, but each Backstage instance may integrate content or
  -cards to suit their needs on different pages, tabs, etc. Note that stand-alone
  -plugins that are not "attached" to the Software Catalog would be added outside
  -the `EntityPage`.
  + cards to suit their needs on different pages, tabs, etc. In addition, while some
  + plugins such as this example are designed to annotate or support specific software
  + catalog entities, others may be intended to be used in a stand-alone fashion and
  + would be added outside the `EntityPage`, such as being added to the main navigation.
  +
  +3. _[Optional]_ Add a proxy config:
  -4. [Optional] Add proxy config:
  + Plugins that collect data off of external services may require the use of a proxy service.
  + This plugin accesses the CircleCI REST API, and thus requires a proxy definition.
  ```yaml
  // app-config.yaml
  