[docs] [issue31487] Improve f-strings documentation wrt format specifiers

[Martin Panter]

Martin Panter added the comment:

>>> f"{number:#0x}"  # using integer format specifier

It’s not clear what your purpose was adding the above line, but the zero flag (0) does nothing because there is no “width” field. I think it could be misleading, because it is actually the “#x” codes that generate the “0x” prefix.

If you want to illustrate a minimum width, I suggest something like

>>> f"{number:#06x}"
'0x0400'

or (if the number is never negative)

>>> f"0x{number:04X}"
'0x0400'

Or if you don’t care about the width:

>>> f"{number:#x}"
'0x400'

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nosy: +martin.panter

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<https://bugs.python.org/issue31487>
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