Update docs

scripts/generate/format-lines.js

@@ -0,0 +1,16 @@
+function formatLines(...lines) {
+  return [...indentEach(0, lines)].join('\n') + '\n';
+}
+
+function* indentEach(indent, lines) {
+  for (const line of lines) {
+    if (Array.isArray(line)) {
+      yield* indentEach(indent + 1, line);
+    } else {
+      const padding = '    '.repeat(indent);
+      yield* line.split('\n').map(subline => (subline === '' ? '' : padding + subline));
+    }
+  }
+}
+
+module.exports = formatLines;