Add example to clear the usage of extra_opts (#31873)

lib/ansible/modules/files/unarchive.py

@@ -118,6 +118,14 @@ EXAMPLES = r'''
     src: https://example.com/example.zip
     dest: /usr/local/bin
     remote_src: yes
+
+- name: Unarchive a file with extra options
+  unarchive:
+    src: /tmp/foo.zip
+    dest: /usr/local/bin
+    extra_opts:
+    - --transform
+    - s/^xxx/yyy/
 '''
 
 import binascii