DOC: Elaborated marker style documentation for custom-defined markers

Author: cimarronm

lib/matplotlib/markers.py

@@ -45,6 +45,8 @@
 ""                             nothing
 ``'$...$'``                    render the string using mathtext.
 `verts`                        a list of (x, y) pairs used for Path vertices.
+                               The center of the marker is located at (0,0) and
+                               the size is normalized.
 path                           a `~matplotlib.path.Path` instance.
 (`numsides`, `style`, `angle`) see below
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