Added one extra example in the authorized_key module. (#3637)

system/authorized_key.py

@@ -124,6 +124,14 @@ EXAMPLES = '''
 - authorized_key: user=root key="{{ item }}" state=present exclusive=yes
   with_file:
     - public_keys/doe-jane
+
+# Copies the key from the user who is running ansible to the remote machine
+- set_fact:
+    my_ssh_key: "{{ lookup('env','HOME') }}/.ssh/id_rsa.pub"
+
+- authorized_key: user=ubuntu key="{{ lookup('file', my_ssh_key) }}"
+  sudo: yes
+
 '''
 
 # Makes sure the public key line is present or absent in the user's .ssh/authorized_keys.