feat(typeof): Create documentation for new helper typeof
          #903
        
          
      
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[DEVDOCS-]
Add documentation on usage of newly introduced
typeofstencil helper.What changed?
Release notes draft
The newly-released
typeofhelper for stencil theme developers is now available to use. Now, you’ll be able to query data types inside your themes.Anything else?
References to:
Screenshot of "preview" for associated markdown.

ping @jairo-bc @bc-traciporter