docs: improving docs for minimizing options in webpack config

[dbailo1988]

Please check if the PR fulfills these requirements

• [ x] Tests for the changes have been added (for bug fixes / features)
• [x ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:
  I found myself problems doing the config for the minimizer so I hope it's more clear
  What is the current behavior? (You can also link to an open issue here)
  No behavior change

What is the new behavior?
No behavior change

Does this PR introduce a breaking change?

• Yes
• No

If this PR contains a breaking change, please describe the following...

• Impact:
• Migration path for existing applications:
• Github Issue(s) this is regarding:
  Webpack 2 and -minimize #112
  minimize option seems to disable generation of requires. #107
  How to turn off minification? #65

Other information:

[jsf-clabot]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #116 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #116   +/-   ##
======================================
  Coverage    96.8%   96.8%           
======================================
  Files           2       2           
  Lines          94      94           
  Branches       18      18           
======================================
  Hits           91      91           
  Misses          3       3

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[hemanth]

Sweet!