Fix a typo

kernel/modelverse_kernel/primitives.py

@@ -18,7 +18,7 @@ class InterpretedFunctionFinished(Exception):
 #
 # ### Rationale for __exception_return
 #
-# __exception_return is a useful mechanism because it allows us to have an __call_function
+# __exception_return is a useful mechanism because it allows us to have a __call_function
 # implementation that has O(1) state read overhead. A previous implementation of
 # __call_function checked if the caller's frame had been popped whenever
 # ModelverseKernel.execute_yield threw a StopIteration exception. However, that incurs O(n) overhead