Update box-plots.md

- There is no need for passing dummy variable `y` when stats have already been computed
- `upperfence` values don't match the resulting figure.
- It could be simplified even further by getting rid of the extra call to `add_trace` but I've kept it to follow the documentation styling.
- It might be worth it to separate the example in two cases: (i) with only `q1`, `median`, `q3` provided, (ii) with all values provided.

Author: patelvyom

doc/python/box-plots.md

@@ -233,16 +233,10 @@ import plotly.graph_objects as go
 
 fig = go.Figure()
 
-fig.add_trace(go.Box(y=[
-        [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ],
-        [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ],
-        [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ]
-      ], name="Precompiled Quartiles"))
-
-fig.update_traces(q1=[ 1, 2, 3 ], median=[ 4, 5, 6 ],
+fig.add_trace(go.Box(q1=[ 1, 2, 3 ], median=[ 4, 5, 6 ],
                   q3=[ 7, 8, 9 ], lowerfence=[-1, 0, 1],
-                  upperfence=[5, 6, 7], mean=[ 2.2, 2.8, 3.2 ],
-                  sd=[ 0.2, 0.4, 0.6 ], notchspan=[ 0.2, 0.4, 0.6 ] )
+                  upperfence=[7, 8, 9], mean=[ 2.2, 2.8, 3.2 ],
+                  sd=[ 0.2, 0.4, 0.6 ], notchspan=[ 0.2, 0.4, 0.6 ], name="Precompiled Quartiles"))
 
 fig.show()
 ```