Update CommandBar description

[Jay-o-Way]

Description

Quick update to the description (copy from MS Learn)

Motivation and Context

Text is outdated / does not apply. fixes #1518

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

[karkarl]

/azp run