Add tickmode="sync" example

doc/python/multiple-axes.md

@@ -352,5 +352,67 @@ fig.show()
 
 ```
 
+### Sync Axes Ticks
+
+
+*New in 5.13*
+
+With overlayed axes, each axis by default has its own number of ticks. You can sync the number of ticks on a cartesian axis with another one it overlays by setting `tickmode="sync"`. In this example, we sync the ticks on the `"Total bill amount"` axis with the `"Total number of diners"` axis that it overlays. 
+
+```python
+import plotly.graph_objects as go
+from plotly.data import tips
+
+df = tips()
+
+summed_values = df.groupby(by="day", as_index=False).sum(numeric_only=True)
+day_order_mapping = {"Thur": 0, "Fri": 1, "Sat": 2, "Sun": 3}
+summed_values["order"] = summed_values["day"].apply(lambda day: day_order_mapping[day])
+summed_values = summed_values.sort_values(by="order")
+
+days_of_week = summed_values["day"].values
+total_bills = summed_values["total_bill"].values
+number_of_diners = summed_values["size"].values
+
+
+fig = go.Figure(
+    data=go.Bar(
+        x=days_of_week,
+        y=number_of_diners,
+        name="Total number of diners",
+        marker=dict(color="paleturquoise"),
+    )
+)
+
+fig.add_trace(
+    go.Scatter(
+        x=days_of_week,
+        y=total_bills,
+        yaxis="y2",
+        name="Total bill amount",
+        marker=dict(color="crimson"),
+    )
+)
+
+fig.update_layout(
+    legend=dict(orientation="h"),
+    yaxis=dict(
+        title=dict(text="Total number of diners"),
+        side="left",
+        range=[0, 250],
+    ),
+    yaxis2=dict(
+        title=dict(text="Total bill amount"),
+        side="right",
+        range=[0, 2000],
+        overlaying="y",
+        tickmode="sync",
+    ),
+)
+
+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.