Update module description and help files

[johlju]

Pull Request (PR) description

• SqlServerDsc
  • Update module description on GitHub, in the conceptual help, and in
    the module manifest.

This Pull Request (PR) fixes the following issues

None.

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 updated in the resource's README.md.
• Resource parameter descriptions updated in schema.mof.
• Comment-based help updated, including parameter descriptions.
• Localization strings updated.
• Examples updated.
• Unit tests updated. See DSC Community Testing Guidelines.
• Integration tests updated (where possible). See DSC Community Testing Guidelines.
• Code changes adheres to DSC Community Style Guidelines.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94%. Comparing base (a3d9ab3) to head (9d8d1af).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #2080   +/-   ##
====================================
  Coverage    94%     94%           
====================================
  Files       104     104           
  Lines      8090    8090           
====================================
  Hits       7663    7663           
  Misses      427     427           

Flag	Coverage Δ
unit	94% <ø> (ø)

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