[ReleasePR reservations] Fix S360 Linting Errors in Microsoft.Capacity (#2064)

Create to sync Azure/azure-rest-api-specs#16775
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Author: msftbot[bot]

schemas/2020-10-25/Microsoft.Capacity.json

@@ -77,8 +77,21 @@
           "description": "Additional properties for the specified resource provider."
         },
         "resourceType": {
-          "type": "object",
-          "properties": {},
+          "oneOf": [
+            {
+              "type": "string",
+              "enum": [
+                "standard",
+                "dedicated",
+                "lowPriority",
+                "shared",
+                "serviceSpecific"
+              ]
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
           "description": "The name of the resource type."
         },
         "unit": {