Fix non-matching defaults. (#5452) (#5454)

(cherry picked from commit f84a9bf932)

plugins/modules/cloud/spotinst/spotinst_aws_elastigroup.py

@@ -502,6 +502,12 @@ options:
         Only works if wait_for_instances is True.
     type: int
 
+  do_not_update:
+    description:
+      - TODO document.
+    type: list
+    default: []
+
 '''
 EXAMPLES = '''
 # Basic configuration YAML example