Update src/spikeinterface/preprocessing/directional_derivative.py

Co-authored-by: Zach McKenzie <[email protected]>

src/spikeinterface/preprocessing/directional_derivative.py

@@ -34,7 +34,7 @@ def __init__(
             Gradients will be taken along this dimension.
         order : int, default: 1
             np.gradient will be applied this many times.
-        edge_order : int, default 1
+        edge_order : int, default: 1
             Order of gradient accuracy at edges; see np.gradient for details.
         dtype : numpy dtype, default "float32"
             If None, parent dtype is preserved, but the derivative can