message: Update cli-build-system.md
  Fix some wording/typos.
diff: @@ -38,7 +38,7 @@ In addition, there are a number of hard and soft requirements:
  - Scale - It should scale to hundreds of large packages without excessive wait
  times
  - Reloads - The development flow should support quick on-save hot reloads
  -- Simple - Usage should simple and configuration should be kept minimal
  +- Simple - Usage should be simple and configuration should be kept minimal
  - Universal - Development towards both web applications, isomorphic packages,
  and Node.js
  - Modern - The build system targets modern environments
  @@ -95,7 +95,7 @@ These are the available roles that are currently supported by the Backstage buil
  | Role | Description | Example |
  | ---------------------- | -------------------------------------------- | -------------------------------------------- |
  -| frontend | Bundled frontend application | `package/app` |
  +| frontend | Bundled frontend application | `packages/app` |
  | backend | Bundled backend application | `packages/backend` |
  | cli | Package used as a command-line interface | `@backstage/cli`, `@backstage/codemods` |
  | web-library | Web library for use by other packages | `@backstage/plugin-catalog-react` |
  