Add ec2_vpc_route_table example, fix typo (#32415)

* Add an example in the `ec2_vpc_route_table` module of deleting a
route table.
* Fix a typo in the AWS development guidelines, from `fail_json.aws()` to
`fail_json_aws()`.

lib/ansible/modules/cloud/amazon/GUIDELINES.md

@@ -198,7 +198,7 @@ _fail_json_aws() is a new method and may be subject to change.  You can use it i
 being contributed back to Ansible, however if you are publishing your module separately please
 don't use it before the start of 2018 / Ansible 2.4_
 
-In the AnsibleAWSModule there is a special method, `module.fail_json.aws()` for nice reporting of
+In the AnsibleAWSModule there is a special method, `module.fail_json_aws()` for nice reporting of
 exceptions.  Call this on your exception and it will report the error together with a traceback for
 use in Ansible verbose mode.
 

lib/ansible/modules/cloud/amazon/ec2_vpc_route_table.py

@@ -128,6 +128,13 @@ EXAMPLES = '''
         instance_id: "{{ nat.instance_id }}"
   register: nat_route_table
 
+- name: delete route table
+  ec2_vpc_route_table:
+    vpc_id: vpc-1245678
+    region: us-west-1
+    route_table_id: "{{ route_table.id }}"
+    lookup: id
+    state: absent
 '''
 
 import re