update trigger type enum - schedule for jobs (Azure#24400)

Author: anandanthony

specification/app/resource-manager/Microsoft.App/preview/2022-11-01-preview/Jobs.json

@@ -654,7 +654,7 @@
         "triggerType": {
           "description": "Trigger type of the job",
           "enum": [
-            "Scheduled",
+            "Schedule",
             "Event",
             "Manual"
           ],

specification/app/resource-manager/Microsoft.App/preview/2023-04-01-preview/Jobs.json

@@ -666,7 +666,7 @@
         "triggerType": {
           "description": "Trigger type of the job",
           "enum": [
-            "Scheduled",
+            "Schedule",
             "Event",
             "Manual"
           ],