fix: ensure docs include @returns Promise<void> where appropriate
          #3954
        
          
      
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Motivation/Description of the PR
This PR fixes the generated
typings/types.d.tsdefinitions for methods that use Mustache docs. The intention is similar to #3465, but it fixes the original helper types instead.Note that there are still various methods that aren't typed properly, such as
Playwright._getPageUrl()(currently typed asvoid), because they are missing@returnJSDoc annotations. This should also be fixed, although it may make more sense to do this in a separate PR to keep this one focused.This fixes #3324.
Applicable helpers:
Type of change
Checklist:
addedupdatednpm run docs)npm run lint)npm test)