Announce doc-tooltips to assistive technology

[oykuyilmaz]

Issue #, if available:

• N/A

Description of changes:
Doc-tooltips attached to autocomplete popover are now announced as more content.

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[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (cd55932) 87.13% compared to head (18be0f4) 87.13%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5198   +/-   ##
=======================================
  Coverage   87.13%   87.13%           
=======================================
  Files         564      564           
  Lines       45031    45034    +3     
  Branches     6908     6908           
=======================================
+ Hits        39236    39239    +3     
  Misses       5795     5795           

Flag	Coverage Δ
unittests	87.13% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/autocomplete.js	80.20% <100.00%> (+0.08%)	⬆️
src/autocomplete/popup.js	85.32% <100.00%> (+0.05%)	⬆️
src/autocomplete_test.js	99.42% <100.00%> (ø)

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