Merge pull request matplotlib#19425 from QuLogic/barlabel-units

Add units to bar_label padding documentation.

Author: dstansby

lib/matplotlib/axes/_axes.py

@@ -2541,11 +2541,11 @@ def bar_label(self, container, labels=None, *, fmt="%g", label_type="edge",
               value displayed will be the position of that end-point.
             - 'center': label placed in the center of the bar segment, and the
               value displayed will be the length of that segment.
-              (useful for stacked bars, i.e.
+              (useful for stacked bars, i.e.,
               :doc:`/gallery/lines_bars_and_markers/bar_label_demo`)
 
         padding : float, default: 0
-            Distance of label from the end of the bar.
+            Distance of label from the end of the bar, in points.
 
         **kwargs
             Any remaining keyword arguments are passed through to