Fix jsDoc annotations

[mkslanc]

Issue #, if available:

Description of changes:
Improve JSDoc annotations

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[codecov]

Codecov Report

Merging #4879 (3638ebb) into master (416ae9e) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4879      +/-   ##
==========================================
- Coverage   85.74%   85.73%   -0.01%     
==========================================
  Files         539      539              
  Lines       40602    40602              
  Branches     6419     6419              
==========================================
- Hits        34814    34812       -2     
- Misses       5788     5790       +2     

Flag	Coverage Δ
unittests	85.73% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/ace.js	100.00% <ø> (ø)
src/anchor.js	98.48% <ø> (ø)
src/autocomplete/popup.js	78.09% <ø> (ø)
src/background_tokenizer.js	97.05% <ø> (ø)
src/bidihandler.js	29.89% <ø> (ø)
src/document.js	93.75% <ø> (ø)
src/edit_session.js	85.67% <ø> (ø)
src/keyboard/vim.js	89.54% <ø> (ø)
src/lib/bidiutil.js	19.91% <ø> (ø)
src/mode/folding/sqlserver.js	25.64% <ø> (ø)
... and 5 more

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