WebConfigPropertyCollection: Allow deleting single item property collections, update examples, remove duplicate resource documentation

[Borgquite]

Pull Request (PR) description

Add support for single item property value collections - add is already supported with the correct syntax, so have updated examples & added 'delete' support.

(NB 'Updating' a single item property value collection is pretty meaningless as there's nothing relevant to 'update' - you can only add or delete).

Also removing the duplicated resource documentation under README.md. Most resources solely rely on the Wiki, which should surely be the 'single source of truth' for resource documentation now, like for other modules?

This Pull Request (PR) fixes the following issues

• Fixes xWebConfigPropertyCollection: support single property collection #379
• Fixes WebConfigPropertyCollection needs to allow null or empty strings for specific collection items like '/system.webServer/security/requestFiltering/hiddenSegments' #631

Task list

• Added an entry to the change log under the Unreleased section of the file CHANGELOG.md.
  Entry should say what was changed and how that affects users (if applicable), and
  reference the issue being resolved (if applicable).
• Resource documentation added/updated in README.md.
• Resource parameter descriptions added/updated in README.md, schema.mof and comment-based
  help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Community Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

---

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88%. Comparing base (c5e65a4) to head (1f0f354).
Report is 2 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #644   +/-   ##
===================================
  Coverage    88%    88%           
===================================
  Files        15     15           
  Lines      1952   1954    +2     
===================================
+ Hits       1726   1728    +2     
  Misses      226    226           

Files with missing lines	Coverage Δ
...rtyCollection/DSC_WebConfigPropertyCollection.psm1	98% <100%> (+<1%)	⬆️

[dan-hughes]

@johlju.

Reviewed 3 of 6 files at r1, 6 of 6 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Borgquite)

[dan-hughes]

One thing I've just thought about @Borgquite, can you add a link in the README to the Wiki. e.g.

'The resource examples are also available in the WebAdministrationDsc Wiki.'

[Borgquite]

@dan-hughes Already there?

WebAdministrationDsc/README.md

Line 42 in c3efe11

The resource examples are also available in the [WebAdministration Wiki](https://github.com/dsccommunity/WebAdministrationDsc/wiki).

[dan-hughes]

@dan-hughes Already there?

WebAdministrationDsc/README.md

Line 42 in c3efe11

The resource examples are also available in the [WebAdministration Wiki](https://github.com/dsccommunity/WebAdministrationDsc/wiki).

So it is. I went to the bottom, saw the examples and didn't look very hard after that!

Could do with cleaning up the two examples headings.

Beat me to it!

Should be good now.

[Borgquite]

@dan-hughes Ah, I see what's happened - there are two Examples sections in the README file, one with, one without.

I've just merged them