SqlSetup: Update requirements section

[johlju]

Pull Request (PR) description

• SqlSetup
  • Documented that on certain operating systems, when using least privilege
    for the service account, the security policy setting Network access: Restrict
    clients allowed to make remote calls to SAM can result in a access denied
    error during install of the SQL Server Database Engine (issue SqlServerDsc SqlSetup "Access Denied" on install Domain Admin needed. #1559).

This Pull Request (PR) fixes the following issues

• Fixes SqlServerDsc SqlSetup "Access Denied" on install Domain Admin needed. #1559

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

Merging #1591 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1591   +/-   ##
======================================
  Coverage      98%     98%           
======================================
  Files          37      37           
  Lines        6082    6082           
======================================
  Hits         5978    5978           
  Misses        104     104           

Flag	Coverage Δ
#unit	98% <ø> (ø)

[johlju]

Reviewed 2 of 2 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved