DOC: fix chart output in compound chart docs
@@ -272,7 +272,7 @@ Using ``alt.facet`` it becomes a bit cleaner:
.. altair-plot::
- chart = alt.Chart(iris).mark_point().encode(
+ alt.Chart(iris).mark_point().encode(
x='petalLength:Q',
y='petalWidth:Q',
color='species:N'
