DOC: add stroke to graticule example
@@ -271,7 +271,7 @@ lines on a geographic visualization, known as a graticule. These can be created
data = alt.graticule(step=[15, 15])
- alt.Chart(data).mark_geoshape().project(
+ alt.Chart(data).mark_geoshape(stroke='black').project(
'orthographic',
rotate=[0, -45, 0]
)
