docs(Dropdown): update docs regarding renderSelectedItem

[lucivpav]

Fixes #1584

[codecov]

Codecov Report

Merging #1856 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1856      +/-   ##
==========================================
- Coverage   69.74%   69.74%   -0.01%     
==========================================
  Files         885      885              
  Lines        7787     7786       -1     
  Branches     2249     2248       -1     
==========================================
- Hits         5431     5430       -1     
  Misses       2348     2348              
  Partials        8        8

Impacted Files	Coverage Δ
...ackages/react/src/components/Dropdown/Dropdown.tsx	88.04% <ø> (ø)	⬆️
packages/react/src/components/Popup/Popup.tsx	65.92% <0%> (-0.19%)	⬇️
packages/react/src/lib/doesNodeContainClick.tsx	100% <0%> (ø)	⬆️
packages/react/src/components/Dialog/Dialog.tsx	35.29% <0%> (ø)	⬆️

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[lucivpav]

@layershifter is this actually a bug? If the behavior on master is expected, then we should update the prop documentation (which doesn't make it clear the prop only works when multiple is used)

[layershifter]

@layershifter is this actually a bug?

Not, it's not a bug. renderSelectItem should be applied to DropdownSelectedItem, so proper fix is to update prop description.