Editing Sam's downloads page

src/site/_includes/downloads/_pick_an_editor.markdown

Index: src/site/_includes/downloads/_pick_an_editor.markdown
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+You can choose from many editor solutions.
+
+{% include downloads/_other_editors.markdown %}
+
+### Dart Editor
+
+Dart Editor is a powerful tool for editing, debugging, and running Dart
+applications.
+
+{% include downloads/_dart-editor.html buttonclass="btn-primary" %}
+
+To enable automatic updates of Dart Editor and Dart,
+go to the Dart Editor **Preferences**, choose **Update**,
+and select **Download updates automatically**.
+For more information, see the documentation for
+[Dart Editor](/tools/editor/).