Fix doc

Author: alessandrocucci

Doc/library/timeit.rst

@@ -214,7 +214,7 @@ Command-Line Interface
 
 When called as a program from the command line, the following form is used::
 
-   python -m timeit [-n N] [-r N] [-u U] [-s S] [-m M] [-h] [statement ...]
+   python -m timeit [-n N] [-r N] [-u U] [-s S] [-h] [statement ...]
 
 Where the following options are understood: