Update funnel-charts.md

Author: LiamConnors

doc/python/funnel-charts.md

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 ```
 
+### Pattern Fills
+
+*New in 5.15*
+
+Funnel area charts support [patterns](/python/pattern-hatching-texture/) (also known as hatching or texture) in addition to color. In this example, we add a pattern to the second stage of the funnel.
+
+```python
+from plotly import graph_objects as go
+
+colors = ["gold", "gold", "lightgreen", "lavender"]
+
+fig = go.Figure(go.Funnelarea(
+    labels = ["Interview 1","Interview 2", "Test", "Final Stage"],
+    values = [100, 70, 40, 20],
+    textfont_size=20,
+    marker={"colors":colors, "pattern": {"shape": ["", "/", "", ""]}},
+    ))
+fig.show()
+```
+
 #### Reference
 
 See [function reference for `px.(funnel)`](https://plotly.com/python-api-reference/generated/plotly.express.funnel) or https://plotly.com/python/reference/funnel/ and https://plotly.com/python/reference/funnelarea/ for more information and chart attribute options!