[docs] [issue17670] Improve str.expandtabs() doc

[Ezio Melotti]

Ezio Melotti added the comment:

"This doesn’t understand other non-printing characters or escape sequences."

This might also be improved.  Does it mean that all characters are considered having len(c) == 1, even if they are not printable or escape sequence (and which escape sequences? \f, \v?)?

Adding an example with tabsize=8 might also help, but it might not be necessary if the wording is improved as Eli suggested.

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nosy: +ezio.melotti
type:  -> enhancement

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