Update operators.md

docs/operators.md

@@ -62,7 +62,7 @@ A selection of these and other valid operators are stated below.
 ## Custom
 
 Instead of passing a predefined operator as a string,
-you can define with by passing it to the `pysr` function, with, e.g.,
+you can just define a custom function as Julia code. For example:
 
 ```python
     PySRRegressor(