Fix: doc tooltip positioning

[mkslanc]

Issue #, if available:

Description of changes:

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Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.05%. Comparing base (a4b9d2d) to head (fe9c2a7).
⚠️ Report is 70 commits behind head on master.

Files with missing lines	Patch %	Lines
src/autocomplete.js	75.00%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5738      +/-   ##
==========================================
- Coverage   87.06%   87.05%   -0.01%     
==========================================
  Files         598      598              
  Lines       43713    43789      +76     
  Branches     7164     7186      +22     
==========================================
+ Hits        38057    38120      +63     
- Misses       5656     5669      +13     

Flag	Coverage Δ
unittests	87.05% <75.00%> (-0.01%)	⬇️

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