docs/library/machine: Typo fix in machine_callbacks section.

docs/library/machine.rst

@@ -17,7 +17,7 @@ A note of callbacks used by functions and class methods of ``machine`` module:
 all these callbacks should be considered as executing in an interrupt context.
 This is true for both physical devices with IDs >= 0 and "virtual" devices
 with negative IDs like -1 (these "virtual" devices are still thin shims on
-top of real hardware and real hardware intrerrupts). See :ref:`isr_rules`.
+top of real hardware and real hardware interrupts). See :ref:`isr_rules`.
 
 Reset related functions
 -----------------------