Use Ruby YAML library to serialize Ansible examples (#196)

<!-- This change is generated by MagicModules. -->
/cc @rambleraptor

plugins/modules/gcp_compute_instance.py

@@ -455,26 +455,26 @@ EXAMPLES = '''
 
 - name: create a instance
   gcp_compute_instance:
-      name: "test_object"
-      machine_type: n1-standard-1
-      disks:
-      - auto_delete: true
-        boot: true
-        source: "{{ disk }}"
-      metadata:
-        startup-script-url: gs:://graphite-playground/bootstrap.sh
-        cost-center: '12345'
-      network_interfaces:
-      - network: "{{ network }}"
-        access_configs:
-        - name: External NAT
-          nat_ip: "{{ address }}"
-          type: ONE_TO_ONE_NAT
-      zone: us-central1-a
-      project: "test_project"
-      auth_kind: "serviceaccount"
-      service_account_file: "/tmp/auth.pem"
-      state: present
+    name: test_object
+    machine_type: n1-standard-1
+    disks:
+    - auto_delete: 'true'
+      boot: 'true'
+      source: "{{ disk }}"
+    metadata:
+      startup-script-url: gs:://graphite-playground/bootstrap.sh
+      cost-center: '12345'
+    network_interfaces:
+    - network: "{{ network }}"
+      access_configs:
+      - name: External NAT
+        nat_ip: "{{ address }}"
+        type: ONE_TO_ONE_NAT
+    zone: us-central1-a
+    project: test_project
+    auth_kind: serviceaccount
+    service_account_file: "/tmp/auth.pem"
+    state: present
 '''
 
 RETURN = '''