[docs] [issue21314] Document '/' in signatures

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Hooray!  Now that PEP570 is implemented in 3.8:

>>> def f(a, /, *, b): return 3
...
>>> f(0, b=2)
3
# other combinations raise

and somewhat documented, ('/' in grammar of '8.6 Function definitions', though not explained, should its status become final and listing moved?

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nosy: +terry.reedy

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