Adds more information to the Custom Profile Attributes release notes (#…

…7768)

This change improves the information from the release notes adding
things like the default state of the feature, the feature flag that
controls its availability, the fact that it is enterprise only and the
scope of the initial implementation.

Co-authored-by: Miguel de la Cruz <[email protected]>

source/about/mattermost-v10-changelog.md

@@ -48,8 +48,8 @@ If you upgrade from a release earlier than v10.3, please read the other [Importa
 
 #### Administration
  - Added the migrations, store layer and service for the Property System Architecture.
+ - Added Custom Profile Attributes, an experimental Enterprise-only feature. This feature is disabled by default. To enable this feature, set the feature flag `CustomProfileAttributes`. Once enabled, administrators can access the System Properties section in the System Console to create and manage custom user profile fields. The initial release supports text fields only.
  - Added the Custom Profile Attribute fields store, app and API endpoints.
- - Added the **System Console** user interface for managing Custom Profile Attributes (User Properties).
  - Introduced V2 of the Support Packet, containing improvement diagnosis information for high-availability deployments.
  - Added a new ``Fallback`` field to ``PluginSettingsSection`` that controls whether the settings defined under the section should still render as fallback when the plugin is disabled.
  - Updated the library used for tooltips throughout the app to fix a memory leak.