[ReleasePR desktopvirtualization] fix description for maintenance window time zone (#2361)

Create to sync Azure/azure-rest-api-specs#18905
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/desktopvirtualization?expand=1)

Author: msftbot[bot]

schemas/2022-02-10-preview/Microsoft.DesktopVirtualization.json

@@ -704,11 +704,11 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "List of maintenance windows. Maintenance windows are 2 hours long."
+          "description": "The maintenance windows (day and time) for updating the agent components. At least 1 window must be specified. Optionally, a 2nd window can be specified."
         },
         "maintenanceWindowTimeZone": {
           "type": "string",
-          "description": "Time zone for maintenance as defined in https://docs.microsoft.com/en-us/dotnet/api/system.timezoneinfo.findsystemtimezonebyid?view=net-5.0. Must be set if useLocalTime is true."
+          "description": "The time zone for updating the agent components. Valid time zones can be found here: https://docs.microsoft.com/en-us/dotnet/api/system.timezoneinfo.findsystemtimezonebyid?view=net-5.0. A time zone must be specified if useSessionHostLocalTime is false."
         },
         "type": {
           "oneOf": [
@@ -723,7 +723,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "The type of maintenance for session host components."
+          "description": "The preferred mechanism for updating the agent components. This is either Scheduled or Default."
         },
         "useSessionHostLocalTime": {
           "oneOf": [
@@ -734,10 +734,10 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "Whether to use localTime of the virtual machine."
+          "description": "Boolean indicating whether to update the agent components in the local time zone of each session host in the host pool. By default, this is false."
         }
       },
-      "description": "The session host configuration for updating agent, monitoring agent, and stack component."
+      "description": "The preferred settings for updating the agent components (RDAgent, Geneva Monitoring agent, and side-by-side stack) on session hosts."
     },
     "ApplicationGroupProperties": {
       "type": "object",
@@ -941,7 +941,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "The session host configuration for updating agent, monitoring agent, and stack component."
+          "description": "The preferred settings for updating the agent components (RDAgent, Geneva Monitoring agent, and side-by-side stack) on session hosts."
         },
         "customRdpProperty": {
           "type": "string",
@@ -1254,7 +1254,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "Day of the week."
+          "description": "The day of the week (Monday-Sunday)."
         },
         "hour": {
           "oneOf": [
@@ -1265,7 +1265,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "The update start hour of the day. (0 - 23)"
+          "description": "The starting hour of the maintenance window (0-23). Note that maintenance windows are 2 hours long. This means that updates can be applied anytime from the specified start hour to 2 hours after."
         }
       },
       "description": "Maintenance window starting hour and day of week."