Increase spacing between list items to improve readability (#5962)

_static/css/custom.css

@@ -237,6 +237,12 @@ article ol,
     line-height: 25px;
 }
 
+.rst-content section ul li {
+    /* Increase spacing between list items. */
+    margin-top: 8px;
+    margin-bottom: 8px;
+}
+
 body,
 .rst-content table.docutils thead {
     color: var(--body-color);