Merge pull request matplotlib#24072 from meeseeksmachine/auto-backport-of-pr-24069-on-v3.6.x

Backport PR matplotlib#24069 on branch v3.6.x (Clarification of marker size in scatter)

Author: timhoffm

lib/matplotlib/axes/_axes.py

@@ -4402,7 +4402,7 @@ def scatter(self, x, y, s=None, c=None, marker=None, cmap=None, norm=None,
             The data positions.
 
         s : float or array-like, shape (n, ), optional
-            The marker size in points**2.
+            The marker size in points**2 (typographic points are 1/72 in.).
             Default is ``rcParams['lines.markersize'] ** 2``.
 
         c : array-like or list of colors or color, optional