Merge branch 'march-docs' of https://github.com/plotly/plotly.py into march-docs

Author: LiamConnors

doc/python/shapes.md

@@ -851,7 +851,7 @@ fig.add_shape(
     x1=5,
     y1=3,
     line_width=3,
-    label=dict(text="Label padding of 30", padding=30),
+    label=dict(text="Label padding of 30px", padding=30),
 )
 
 fig.add_shape(
@@ -862,7 +862,7 @@ fig.add_shape(
     x1=2,
     y1=3,
     line_width=3,
-    label=dict(text="No label padding"),
+    label=dict(text="Default label padding of 3px"),
 )
 
 fig.show()