Update adafruit_datetime.py

Co-authored-by: Neradoc <[email protected]>

Author: ladyada

adafruit_datetime.py

@@ -1525,7 +1525,7 @@ def timestamp(self) -> float:
         Note that Floats on most boards are encoded in 30 bits
         internally, with effectively 22 bits of precision. As a result,
         for modern dates this value can be off by several minutes.
-        As a workaround you can access the function ``_mitime()``
+        As a workaround you can access the function ``_mktime()``
         to get an int version of the timestamp.
         """
         if not self._tzinfo is None: