Fix an invalid escape sequence.

QuLogic · QuLogic · commit 7ecca63c1c9a · 2018-08-28T20:59:26.000-04:00
diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py
@@ -1510,7 +1510,7 @@ def setp(obj, *args, **kwargs):
 
 
 def kwdoc(artist):
-    """
+    r"""
     Inspect an `~matplotlib.artist.Artist` class and return
     information about its settable properties and their current values.
 
