message: Improve phrasing of CLI description
  The replaced wording referred to both "is" and "are" in the same sentence.
diff: @@ -79,11 +79,11 @@ want to ensure some stability.
  ### [`cli`](https://github.com/backstage/backstage/tree/master/packages/cli/)
  -The main toolchain used for Backstage development. The interface that is
  -considered for stability are the various commands and options passed to those
  -commands, as well as the environment variables read by the CLI. The build output
  -may change over time and is not considered a breaking change unless it is likely
  -to affect external tooling.
  +The main toolchain used for Backstage development. The various CLI commands and
  +options passed to those commands, as well as the environment variables read by
  +the CLI, are considered to be the interface that the stability index refers to.
  +The build output may change over time and is not considered a breaking change
  +unless it is likely to affect external tooling.
  Stability: `2`
  