Introduced examples for setting default profiles in Examples section

[AmandaDErrico]

Included examples for setting default profiles in zowe config set.

Linked to #1428

[codecov]

Codecov Report

Merging #862 (800ec9e) into master (56ef36d) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #862   +/-   ##
=======================================
  Coverage   89.21%   89.22%           
=======================================
  Files         197      197           
  Lines       10461    10461           
  Branches     2114     2114           
=======================================
+ Hits         9333     9334    +1     
+ Misses       1124     1123    -1     
  Partials        4        4           

Impacted Files	Coverage Δ
...es/imperative/src/config/cmd/set/set.definition.ts	100.00% <ø> (ø)
packages/cmd/src/response/CommandResponse.ts	96.79% <0.00%> (-0.33%)	⬇️
packages/rest/src/client/AbstractRestClient.ts	87.45% <0.00%> (+0.76%)	⬆️

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[t1m0thyj]

LGTM!

[gejohnston]

Looks good.

[github-actions]

Release succeeded for the master branch. 🎉

The following packages have been published:

• npm: @zowe/[email protected]

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