private/model/api: Fix typo in docs.
Fixes typo in operation type's docs.
@@ -72,7 +72,7 @@ const op{{ .ExportedName }} = "{{ .Name }}"
// {{ .ExportedName }}Request generates a "aws/request.Request" representing the
// client's request for the {{ .ExportedName }} operation. The "output" return
-// value will be populated with the request's response once the request complets
+// value will be populated with the request's response once the request completes
// successfuly.
//
// Use "Send" method on the returned Request to send the API call to the service.
