Clarify tiny comment re: AnnotationBbox constructor.

anntzer · anntzer · commit 1fe47b0fa345 · 2020-03-06T00:38:11.000+01:00
`pad` is forwarded to a FancyBboxPatch, not a BboxPatch, which is a
different (unrelated) class...
diff --git a/lib/matplotlib/offsetbox.py b/lib/matplotlib/offsetbox.py
@@ -1428,7 +1428,7 @@ def __init__(self, offsetbox, xy,
                  xybox=None,
                  xycoords='data',
                  boxcoords=None,
-                 frameon=True, pad=0.4,  # BboxPatch
+                 frameon=True, pad=0.4,  # FancyBboxPatch boxstyle.
                  annotation_clip=None,
                  box_alignment=(0.5, 0.5),
                  bboxprops=None,
