Update multiple-axes.md

Author: nicolaskruchten

Diff for: doc/python/multiple-axes.md

@@ -22,7 +22,7 @@ jupyter:
     pygments_lexer: ipython3
     version: 3.7.2
   plotly:
-    description: How to make a graph with multiple axes in python.
+    description: How to make a graph with multiple axes (dual y-axis plots, plots with secondary axes) in python.
     display_as: file_settings
     language: python
     layout: base
@@ -225,4 +225,4 @@ fig.show()
 ```
 
 #### Reference
-All of the y-axis properties are found here: https://plotly.com/python/reference/#YAxis.  For more information on creating subplots see the [Subplots in Python](/python/subplots/) section.
+All of the y-axis properties are found here: https://plotly.com/python/reference/#YAxis.  For more information on creating subplots see the [Subplots in Python](/python/subplots/) section.