Improve accuracy of types in DocBlocks

[jakejackson1]

Not all DocBlocks had accurate type hints. Also adds a missing docblock to DomQuery::insertAfter()

Pull Request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Build-related changes
• [X] Documentation content changes
• [ ] Other (please describe):

[codecov[bot]]

Codecov Report

Merging #42 (d264d91) into main (4280f56) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #42   +/-   ##
=========================================
  Coverage     88.40%   88.40%           
  Complexity     1349     1349           
=========================================
  Files            26       26           
  Lines          3088     3088           
=========================================
  Hits           2730     2730           
  Misses          358      358           

Impacted Files	Coverage Δ
src/DOMQuery.php	82.00% <ø> (ø)
src/Helpers/QueryMutators.php	95.34% <ø> (ø)

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