fix: change metadata cascade policy scope to string (#381)

openapi.json

@@ -14,7 +14,7 @@
       "url": "http://www.apache.org/licenses/LICENSE-2.0"
     },
     "version": "2.0.0",
-    "x-box-commit-hash": "9e8bda337c"
+    "x-box-commit-hash": "318f08c2f5"
   },
   "servers": [
     {
@@ -30164,6 +30164,10 @@
         "x-box-resource-id": "metadata_cascade_policy",
         "x-box-tag": "metadata_cascade_policies",
         "description": "A metadata cascade policy automatically applies a metadata template instance\nto all the files and folders within the targeted folder.",
+        "required": [
+          "id",
+          "type"
+        ],
         "properties": {
           "id": {
             "type": "string",
@@ -30218,12 +30222,8 @@
           },
           "scope": {
             "type": "string",
-            "example": "global",
-            "description": "The scope of the of the template that is cascaded down to the folder's\nchildren.",
-            "enum": [
-              "global",
-              "enterprise_*"
-            ]
+            "description": "The scope of the metadata cascade policy can either be `global` or\n`enterprise_*`. The `global` scope is used for policies that are\navailable to any Box enterprise. The `enterprise_*` scope represents\npolicies that have been created within a specific enterprise, where `*`\nwill be the ID of that enterprise.",
+            "example": "enterprise_123456"
           },
           "templateKey": {
             "type": "string",