Correct font weight of table headings

Table headings are bold by default on Learn. Adding formatting for bold results in a lighter weight font than is standard on the platform.

Author: garycentric

microsoft-365/admin/activity-reports/microsoft-365-copilot-usage.md

@@ -96,7 +96,7 @@ To ensure data quality, we perform daily data validation checks for the past thr
 
 ## User activity table
 
-| **Item**                                       | **Description**                                                                                                                               |
+| Item | Description |
 |------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|
 | User name                                      | The user's principal name.                                                                                                                    |
 | Display name                                   | The full name of the user.                                                                                                                    |