SqlAgDatabase: Remove unused help file

[johlju]

Pull Request (PR) description

• SqlAgDatabase
  • Remove unused help file (issue SqlAgDatabase: Remove unused conceptual help file #1745).

This Pull Request (PR) fixes the following issues

• Fixes SqlAgDatabase: Remove unused conceptual help file #1745

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 ✅

Comparison is base (c26c06f) 94% compared to head (c25b378) 94%.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #1998   +/-   ##
====================================
  Coverage    94%     94%           
====================================
  Files        93      93           
  Lines      7848    7848           
====================================
  Hits       7428    7428           
  Misses      420     420           

Flag	Coverage Δ
unit	94% <ø> (ø)

[johlju]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @johlju)