update shape layer example

Author: LiamConnors

doc/python/shapes.md

@@ -1118,40 +1118,40 @@ fig = px.line(df)
 
 fig.add_shape(
     type="rect",
-    x0="2018-01-24",
+    x0="2018-03-01",
     y0=0,
-    x1="2018-08-18",
+    x1="2018-08-01",
     y1=3,
     line_width=0,
     layer="above",
     label=dict(text="Above", textposition="top center", font=dict(size=15)),
-    fillcolor="LightSkyBlue",
+    fillcolor="LightGreen",
     opacity=0.80,
 )
 
 fig.add_shape(
     type="rect",
-    x0="2018-09-24",
+    x0="2018-10-01",
     y0=0,
-    x1="2019-04-18",
+    x1="2019-03-01",
     y1=3,
     line_width=0,
     layer="between",
     label=dict(text="Between", textposition="top center", font=dict(size=15)),
-    fillcolor="LightSkyBlue",
+    fillcolor="LightGreen",
     opacity=0.80,
 )
 
 fig.add_shape(
     type="rect",
-    x0="2019-05-24",
+    x0="2019-05-01",
     y0=0,
-    x1="2019-11-18",
+    x1="2019-10-01",
     y1=3,
     line_width=0,
     layer="below",
     label=dict(text="Below", textposition="top center", font=dict(size=15)),
-    fillcolor="LightSkyBlue",
+    fillcolor="LightGreen",
     opacity=0.80,
 )