Display documentation for auto completion items when addBrackets is true

[DonJayamanne]

Fixes #452

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• Has unit tests & code coverage is not adversely affected (within reason)
• Works on all actively maintained versions of Python (e.g. Python 2.7 & the latest Python 3 release)
• Works on Windows 10, macOS, and Linux (e.g. considered file system case-sensitivity)

[codecov]

Codecov Report

Merging #1659 into master will increase coverage by 0.11%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master    #1659      +/-   ##
==========================================
+ Coverage    71.4%   71.52%   +0.11%     
==========================================
  Files         277      277              
  Lines       12985    13021      +36     
  Branches     2334     2346      +12     
==========================================
+ Hits         9272     9313      +41     
+ Misses       3578     3574       -4     
+ Partials      135      134       -1

Impacted Files	Coverage Δ
src/client/providers/itemInfoSource.ts	87.09% <100%> (ø)	⬆️
src/client/providers/completionProvider.ts	100% <100%> (ø)	⬆️
src/client/providers/completionSource.ts	95.38% <91.66%> (+2.16%)	⬆️
src/client/debugger/mainV2.ts	75% <0%> (-0.81%)	⬇️
...on/terminal/environmentActivationProviders/bash.ts	91.89% <0%> (-0.71%)	⬇️
src/client/common/terminal/types.ts	100% <0%> (ø)	⬆️
src/client/common/enumUtils.ts	100% <0%> (ø)	⬆️
src/client/extension.ts	96.18% <0%> (+0.08%)	⬆️
src/client/common/terminal/helper.ts	98.7% <0%> (+0.19%)	⬆️
src/client/debugger/Main.ts	52.34% <0%> (+0.49%)	⬆️
... and 4 more

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