Add subtext for reservatioin name and modify the subtext for consumpt… (#1058)

Add subtext for reservatioin name and modify the subtext for consumption options.

Author: danjuan-81

applications/hcc/metadata.display.yaml

@@ -127,6 +127,7 @@ spec:
           name: reservation
           title: Reservation name
           section: required_config
+          subtext: For optimal performance with distributed AI workloads, reserve densely allocated accelerator capacity. See <a href="https://cloud.google.com/ai-hypercomputer/docs/request-capacity"><i>Request Capacity</i></a> and <a href="https://cloud.google.com/ai-hypercomputer/docs/request-capacity#view-capacity"><i>View the delivered capacity</i></a> for more details.</br>
         reservation_block:
           name: reservation_block
           title: Reservation block