Correct "Y Axis Title" label

Author: misterhay

Diff for: doc/python/figure-labels.md

@@ -111,7 +111,7 @@ fig.add_trace(go.Scatter(
 fig.update_layout(
     title="Plot Title",
     xaxis_title="X Axis Title",
-    yaxis_title="X Axis Title",
+    yaxis_title="Y Axis Title",
     legend_title="Legend Title",
     font=dict(
         family="Courier New, monospace",
@@ -147,4 +147,4 @@ fig.show()
 ```
 
 #### Reference
-See https://plotly.com/python/reference/layout/ for more information!
+See https://plotly.com/python/reference/layout/ for more information!