[a11y BUG] Narrator is not announcing descriptive information for run time gallery graphic Image in the Home Page.

[gregwoo-microsoft]

Launch AI Dev Gallery App
Navigate to AI Dev gallery graphic image and observe the behavior
Actual Result:
Narrator is not announcing descriptive information for run time gallery graphic Image in the Home Page.

Expected Result:
Narrator should announce descriptive information for run time gallery graphic Image in the Home Page.

User Impact: Who rely on the Screen Reader users will confuse if Narrator is not announcing descriptive information for run time gallery graphic Image in the Home Page

Fix: If it is a decorative image please add the "Alt text=Null" or "Role=Presentation" for the images.