Update description to indicate force delete is in preview (#11763)

* updating compute.json for force delete

* update description

* update to string

* updating description

* update description

* update comment

* add example

* added example and updated prettier

* updated prettier

Author: Aishwarya-C-S

specification/compute/resource-manager/Microsoft.Compute/stable/2020-06-01/compute.json

@@ -2804,7 +2804,7 @@
             "in": "query",
             "required": false,
             "type": "boolean",
-            "description": "Optional parameter to force delete virtual machines."
+            "description": "Optional parameter to force delete virtual machines.(Feature in Preview)"
           },
           {
             "$ref": "#/parameters/ApiVersionParameter"
@@ -2824,7 +2824,12 @@
             "description": "No Content"
           }
         },
-        "x-ms-long-running-operation": true
+        "x-ms-long-running-operation": true,
+        "x-ms-examples": {
+          "Force delete a VM": {
+            "$ref": "./examples/ForceDeleteVirtualMachine.json"
+          }
+        }
       },
       "get": {
         "tags": [

specification/compute/resource-manager/Microsoft.Compute/stable/2020-06-01/examples/ForceDeleteVirtualMachine.json

@@ -0,0 +1,14 @@
+{
+  "parameters": {
+    "subscriptionId": "{subscription-id}",
+    "resourceGroupName": "myResourceGroup",
+    "vmName": "myVM",
+    "forceDeletion": "true",
+    "api-version": "2020-06-01"
+  },
+  "responses": {
+    "200": {},
+    "202": {},
+    "204": {}
+  }
+}