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The DocString for id() in 3.5.x & 3.6.x seems to have an incorrect usage example, specifically ``id(obj, /)``.
This is present in 3.5.x & 3.6.x. It does not appear to be present in 2.7.x or 3.4.x.:
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:54:40) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> help(id)
Help on built-in function id in module builtins:
id(obj, /)
 Return the identity of an object.
 This is guaranteed to be unique among simultaneously existing objects.
 (CPython uses the object's memory address.)
>>>

It is supposed to be a function signature, similar to the syntax when you define your own function, rather than a usage example of calling the function.
In this case, the slash notation is described by PEP 457. It is supposed to indicate that "obj" is a positional-only parameter, and not a keyword parameter. If that is what you think is incorrect, perhaps you can suggest a place to explain the notation in Issue 21314.