message: docs: include source code styling section in docs style guide
  Include a source code styling section in the style guide for docs,
  indicating to follow the Angular style guide where possible and
  defining hexidecimal style guidance.
  Closes
  PR Close
diff: @@ -727,6 +727,13 @@ Remember to exclude these files from StackBlitz by listing them in the `stackbli
  <code-example path="docs-style-guide/stackblitz.json" header="stackblitz.json"></code-example>
  +### Source code styling
  +
  +Source code should follow [Angular's style guide](guide/styleguide) where possible.
  +
  +#### Hexadecimals
  +
  +Hexadecimal should use the shorthand where possible, and use only lowercase letters.
  {@a live-examples}
  