Update Copilot's REST API index pages (#56071)

Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

Author: mpchenette

content/rest/copilot/copilot-metrics.md

@@ -1,7 +1,7 @@
 ---
 title: REST API endpoints for Copilot metrics
 shortTitle: Copilot metrics
-intro: Use the REST API to view Copilot metrics.
+intro: Use the REST API to view {% data variables.product.prodname_copilot_short %} metrics.
 versions: # DO NOT MANUALLY EDIT. CHANGES WILL BE OVERWRITTEN BY A 🤖
   fpt: '*'
   ghec: '*'

content/rest/copilot/copilot-user-management.md

@@ -1,7 +1,7 @@
 ---
 title: REST API endpoints for Copilot user management
 shortTitle: Copilot user management
-intro: 'Use the REST API to manage the {% data variables.copilot.copilot_for_business %} or {% data variables.copilot.copilot_enterprise %} subscription for your organization.'
+intro: 'Use the REST API to manage the {% data variables.copilot.copilot_for_business %}{% ifversion ghec %} or {% data variables.copilot.copilot_enterprise %}{% endif %} subscription for your organization.'
 versions: # DO NOT MANUALLY EDIT. CHANGES WILL BE OVERWRITTEN BY A 🤖
   fpt: '*'
   ghec: '*'

content/rest/copilot/index.md

@@ -2,9 +2,7 @@
 title: REST API endpoints for Copilot
 shortTitle: Copilot
 intro: >-
-  Use the REST API to manage the {% data
-  variables.copilot.copilot_for_business %} subscription for your
-  organization.
+  Use the REST API to monitor and manage {% data variables.product.prodname_copilot %}.
 topics:
   - API
 autogenerated: rest