fix: apimanagement/resource-manager/Microsoft.ApiManagement (#5597)

- containining -> containing

Author: nschonni

specification/apimanagement/resource-manager/Microsoft.ApiManagement/stable/2019-01-01/definitions.json

@@ -2,7 +2,7 @@
   "swagger": "2.0",
   "info": {
     "version": "2019-01-01",
-    "description": "A spec file containining all the definitions",
+    "description": "A spec file containing all the definitions",
     "title": "Definitions file"
   },
   "host": "management.azure.com",