Merge pull request adafruit#10764 from d-c-d/patch-1

Update monotonic function docstring for clarity

Author: dhalbert

shared-bindings/time/__init__.c

@@ -22,12 +22,12 @@
 //|
 //|
 //| def monotonic() -> float:
-//|     """Returns an always increasing value of time with an unknown reference
+//|     """Returns an always increasing value of time, in fractional seconds, with an unknown reference
 //|     point. Only use it to compare against other values from `time.monotonic()`
 //|     during the same code run.
 //|
 //|     On most boards, `time.monotonic()` converts a 64-bit millisecond tick counter
-//|     to a float. Floats on most boards are encoded in 30 bits internally, with
+//|     to seconds, as a float. Floats on most boards are encoded in 30 bits internally, with
 //|     effectively 22 bits of precision. The float returned by `time.monotonic()` will
 //|     accurately represent time to millisecond precision only up to 2**22 milliseconds
 //|     (about 1.165 hours).