message: docs: add ngc to glossary
  ngc angular compiler was not mentioned in the glossary.
  Glossary should contain the relevant terms in angular
  which are hard to get. So, added a small defination of
  ngc to the glossary
  PR Close
diff: @@ -627,6 +627,11 @@ The [npm package manager](https://docs.npmjs.com/getting-started/what-is-npm) is
  Learn more about how Angular uses [Npm Packages](guide/npm-packages).
  +{@ ngc}
  +## ngc
  +`ngc` is a Typescript-to-Javascript transpiler that processes Angular decorators, metadata, and templates, and emits JavaScript code.
  +The most recent implementation is internally refered to as `ngtsc` because it's a minimalistic wrapper around the TypeScript compiler `tsc` that adds a transform for processing Angular code.
  +
  {@a O}
  {@a observable}
  