bpo-39702: Remove dotted_name from decorator documentation (pythonGH-25234)

Author: gousaiyang

Doc/reference/compound_stmts.rst

@@ -1138,7 +1138,6 @@ A function definition defines a user-defined function object (see section
           : ["->" `expression`] ":" `suite`
    decorators: `decorator`+
    decorator: "@" `assignment_expression` NEWLINE
-   dotted_name: `identifier` ("." `identifier`)*
    parameter_list: `defparameter` ("," `defparameter`)* "," "/" ["," [`parameter_list_no_posonly`]]
                  :   | `parameter_list_no_posonly`
    parameter_list_no_posonly: `defparameter` ("," `defparameter`)* ["," [`parameter_list_starargs`]]