Replace two occurrences of AdaptedTo with Supports.

[mdickinson]

Fix one odd-looking use of super that was using the AdaptedTo alias for Supports instead of using Supports directly.

While we're here, change one other use of AdaptedTo in a comment, so that we're consistently using Supports everywhere outside the support for the backwards compatibility alias.

[codecov-io]

Codecov Report

Merging #532 into master will increase coverage by 0.14%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #532      +/-   ##
==========================================
+ Coverage   65.15%   65.29%   +0.14%     
==========================================
  Files          44       44              
  Lines        7040     7040              
  Branches     1413     1413              
==========================================
+ Hits         4587     4597      +10     
+ Misses       2030     2021       -9     
+ Partials      423      422       -1

Impacted Files	Coverage Δ
traits/trait_types.py	63.39% <100%> (ø)	⬆️
traits/etsconfig/etsconfig.py	63.58% <0%> (+6.17%)	⬆️

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[mdickinson]

@rahulporuri Would you be available for a quick review?