Update description and fix casing (#34136)

Author: willcho12

specification/support/resource-manager/Microsoft.Support/preview/2022-09-01-preview/support.json

@@ -2662,7 +2662,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {
@@ -2715,7 +2715,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {

specification/support/resource-manager/Microsoft.Support/preview/2023-06-01-preview/examples/ClassifyServices.json

@@ -10,7 +10,7 @@
   "responses": {
     "200": {
       "body": {
-        "ServiceClassificationResults": [
+        "serviceClassificationResults": [
           {
             "serviceId": "/providers/Microsoft.Support/services/5c41904f-1bcf-76e4-7a54-5fc07468f3cc",
             "displayName": "Azure Update Manager",

specification/support/resource-manager/Microsoft.Support/preview/2023-06-01-preview/examples/ClassifyServicesForSubscription.json

@@ -10,7 +10,7 @@
   "responses": {
     "200": {
       "body": {
-        "ServiceClassificationResults": [
+        "serviceClassificationResults": [
           {
             "serviceId": "/providers/Microsoft.Support/services/5c41904f-1bcf-76e4-7a54-5fc07468f3cc",
             "displayName": "Azure Update Manager",

specification/support/resource-manager/Microsoft.Support/preview/2023-06-01-preview/support.json

@@ -2960,7 +2960,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {
@@ -3013,7 +3013,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {

specification/support/resource-manager/Microsoft.Support/stable/2020-04-01/support.json

@@ -1385,7 +1385,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {
@@ -1438,7 +1438,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {

specification/support/resource-manager/Microsoft.Support/stable/2024-04-01/support.json

@@ -2668,7 +2668,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {
@@ -2721,7 +2721,7 @@
           }
         },
         "phoneNumber": {
-          "description": "Phone number. This is required if preferred contact method is phone.",
+          "description": "Phone number. This is required if preferred contact method is phone. It is also required when submitting 'critical' or 'highestcriticalimpact' severity cases.",
           "type": "string"
         },
         "preferredTimeZone": {