Add a helpful comment to the kernel

kernel/modelverse_kernel/main.py

@@ -61,6 +61,10 @@ class ModelverseKernel(object):
         #
         #     self.jit.use_input_function()
         #
+        # To disable source maps in the JIT, uncomment the line below:
+        #
+        #     self.jit.enable_source_maps(False)
+        #
         # To enable tracing in the JIT (for debugging purposes), uncomment
         # the line below:
         #