Update monotonic function docstring for clarity

[d-c-d]

Clarify the return value of the monotonic function to specify it returns fractional seconds.

looking at cpython's time.monotonic() documentation, one sees in the first line "Return the value (in fractional seconds) of a monotonic clock" -

I would have expected a similar introduction when reading that for circuitpython at https://docs.circuitpython.org/en/latest/shared-bindings/time/

I see there is a fall back that says "For more information, refer to the original CPython documentation"

but would it have hurt to have mention that the units of the float returned by time.monotomic was in seconds? ( there are 7 mentions of millisecond(s),

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[dhalbert]

Thanks! I changed the wording a bit, to remove the bold on seconds (because time almost always deals in seconds, and to clarify in the next paragraph. How's that?