[docs] [issue8996] Add a default role to allow writing bare `len` instead of :func:`len`

[Éric Araujo]

Éric Araujo added the comment:

Unless Georg would still like this, I retract the proposal.

Ezio:
> Disabling `...` sounds OK to me (I don't think we have many left, if any).
I think some of them crept up in logging and unittest docs, but they are easy to find with Doc/tools/rst-lint.py

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