docs: examples: remove connected_scatterplot

Caused by
#3156 (comment)

I move over the reference to the NYTimes
article because I think that is valuable.

tests/examples_arguments_syntax/line_custom_order.py

@@ -1,7 +1,7 @@
 """
 Line Chart with Custom Order
 ----------------------------
-By default, the line’s path (order of points in the line) is
+By default, the line's path (order of points in the line) is
 determined by data values on the temporal/ordinal field.
 However, a field can be mapped to the order channel for a custom path.
 
@@ -10,6 +10,9 @@
 order channel to sort the points in the line by time field (year).
 The earliest year (1956) is one endpoint and the latest year (2010)
 is the other endpoint.
+
+This is based on Hannah Fairfield's article 'Driving Shifts Into Reverse'.
+See https://archive.nytimes.com/www.nytimes.com/imagepages/2010/05/02/business/02metrics.html.
 """
 # category: line charts
 import altair as alt

tests/examples_methods_syntax/line_custom_order.py

@@ -1,7 +1,7 @@
 """
 Line Chart with Custom Order
 ----------------------------
-By default, the line’s path (order of points in the line) is
+By default, the line's path (order of points in the line) is
 determined by data values on the temporal/ordinal field.
 However, a field can be mapped to the order channel for a custom path.
 
@@ -10,6 +10,9 @@
 order channel to sort the points in the line by time field (year).
 The earliest year (1956) is one endpoint and the latest year (2010)
 is the other endpoint.
+
+This is based on Hannah Fairfield's article 'Driving Shifts Into Reverse'.
+See https://archive.nytimes.com/www.nytimes.com/imagepages/2010/05/02/business/02metrics.html.
 """
 # category: line charts
 import altair as alt