Add missing documentation for type parameters

[bkoelman]

This PR adds missing documentation for type parameters. These show up in IDE completions (IntelliSense) an the API browser on the documentation website.

Closes #{ISSUE_NUMBER}

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• N/A: Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.74%. Comparing base (72bd6f8) to head (8a7fcf1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1488   +/-   ##
=======================================
  Coverage   90.74%   90.74%           
=======================================
  Files         344      344           
  Lines       11003    11003           
  Branches     1805     1805           
=======================================
  Hits         9985     9985           
  Misses        669      669           
  Partials      349      349           

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