clarify in doc string

jdaviz/configs/imviz/plugins/catalogs/catalogs.py

@@ -340,7 +340,7 @@ def zoom_to_selected(self, padding=0.02, return_bounding_box=False):
         padding : float, optional
             A fractional value representing the padding around the bounding box
             of the selected points. It is applied as a proportion of the largest
-            dimension of the viewer's current limits. Defaults to 0.02.
+            dimension of the current extent of loaded data. Defaults to 0.02.
         return_bounding_box : bool, optional
             If True, returns the bounding box of the zoomed region as
             ((x_min, x_max), (y_min, y_max)). Defaults to False.