[docs] [issue26506] hex() documentation: mention "%x" % int

Ezio Melotti added the comment:

Note: Ezio, do you prefer format(value, 'x') for '{:x}'.format(value)?

While formatting a single value the former is better/shorter, but the latter is perhaps more common since you usually have something else in the string too. The latter can also be used to do something like:

...

...

'{num:x} {num:X} {num:#x} {num:#X}'.format(num=255) 'ff FF 0xff 0XFF'

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