fixup: apply code suggestions on the abstract error handler

Author: shtlrs

pydis_core/utils/error_handling/commands/abc.py

@@ -10,7 +10,7 @@ class AbstractCommandErrorHandler(ABC):
 
     @abstractmethod
     async def should_handle_error(self, error: Exception) -> bool:
-        """A predicate that determines whether the error should be handled or not."""
+        """A predicate that determines whether the error should be handled."""
         raise NotImplementedError
 
     @abstractmethod