Fix: missing documents for modes

[mkslanc]

Issue #, if available: #5895

Description of changes:

• Remove non-existing "log" mode from modelist
• Add examples for MySQL and JSONiq

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.65%. Comparing base (19f426e) to head (47edeee).
⚠️ Report is 12 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5909   +/-   ##
=======================================
  Coverage   87.65%   87.65%           
=======================================
  Files         621      621           
  Lines       45591    45591           
  Branches     7592     7592           
=======================================
  Hits        39963    39963           
  Misses       5628     5628           

Flag	Coverage Δ
unittests	87.65% <ø> (ø)

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