Pass a JSON file to the Lambda's payload (#63261)

* Add an example of passing a JSON file to the Lambda's payload
Events passed to Lambda are commonly in JSON format, the change provides an example of using JSON file as an alternative to the inline YAML payload in the other examples.

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

@@ -106,7 +106,13 @@ EXAMPLES = '''
     wait: true
     tail_log: true
   register: response
-  # the response will have a `logs` key that will contain a log (up to 4KB) of the function execution in Lambda.
+  # the response will have a `logs` key that will contain a log (up to 4KB) of the function execution in Lambda
+
+# Pass the Lambda event payload as a json file.
+- execute_lambda:
+    name: test-function
+    payload: "{{ lookup('file','lambda_event.json') }}"
+  register: response
 
 - execute_lambda:
     name: test-function