update angular docs

[mlabieniec]

Angular documentation updates/additions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #692 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #692   +/-   ##
=======================================
  Coverage   87.28%   87.28%           
=======================================
  Files          72       72           
  Lines        3428     3428           
  Branches      652      652           
=======================================
  Hits         2992     2992           
  Misses        419      419           
  Partials       17       17

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[github-actions]

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