New-DscResourcePowerShellHelp: Update Function and Add Tests

[X-Guardian]

Pull Request (PR) description

This PR updates the New-DscResourcePowerShellHelp function with the following features

• Output help files to resource specific path
• Fix example content processing
• String localization
• Pester tests

This Pull Request (PR) fixes the following issues

• Fixes #329

Task list

• [x] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [x] Documentation added/updated in README.md.
• [ ] Comment-based help added/updated for all new/changed functions.
• [x] Localization strings added/updated in all localization files as appropriate.
• [x] Unit tests added/updated.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #325 into dev will increase coverage by 3%. The diff coverage is 100%.

@@         Coverage Diff         @@
##            dev   #325   +/-   ##
===================================
+ Coverage    75%    79%   +3%     
===================================
  Files        12     12           
  Lines      1651   1701   +50     
  Branches      2      2           
===================================
+ Hits       1251   1346   +95     
+ Misses      398    353   -45     
  Partials      2      2

[johlju]

I will help review this one, but will be off travelling for a few days, so will help get on this them unless someone haven't already reviewed it.

[PlagueHO]

Hi @X-Guardian - can you resolve the conflicts on this one and we'll get it complete and merged. Cheers!