Update legend.md

typo fix

Author: eranws

doc/python/legend.md

@@ -428,10 +428,10 @@ fig.add_trace(go.Streamtube(
 ))
 # Update all traces together
 fig.update_traces(showlegend=True, showscale=False)
-fig.update_layout(width=600, title_text='Exporation of a vector field using several traces')
+fig.update_layout(width=600, title_text='Exploration of a vector field using several traces')
 fig.show()
 ```
 
 #### Reference
 
-See https://plotly.com/python/reference/#layout-legend for more information!
+See https://plotly.com/python/reference/#layout-legend for more information!