Refactor code-style

*   Add more docs to JSDoc

Author: wooorm

lib/index.js

@@ -1,6 +1,6 @@
 /**
- * @typedef {import('unist').Point} Point
  * @typedef {import('unist').Node} Node
+ * @typedef {import('unist').Point} Point
  * @typedef {import('unist').Position} Position
  */
 
@@ -20,11 +20,13 @@
  */
 
 /**
- * Stringify one point, a position (start and end points), or a node’s
- * positional information.
+ * Serialize the positional info of a point, position (start and end points),
+ * or node.
  *
  * @param {Node | NodeLike | Position | PositionLike | Point | PointLike | null | undefined} [value]
+ *   Node, position, or point.
  * @returns {string}
+ *   Positional info.
  */
 export function stringifyPosition(value) {
   // Nothing.