📚 docs: Rename Boolean to boolean in docstrings.

Author: make-github-pseudonymous-again

src/types/Leaf.js

@@ -20,7 +20,7 @@ export default function Leaf(parent) {
  * Returns <code>true</code> if the <code>Leaf</code> object is a leaf. This
  * always returns <code>true</code>.
  *
- * @returns {Boolean}
+ * @returns {boolean}
  */
 Leaf.prototype.isLeaf = function () {
 	return true;

src/types/Node.js

@@ -24,7 +24,7 @@ export default function Node(color, key) {
  * Returns <code>true</code> if the <code>Node</code> object is a leaf. This
  * always returns <code>false</code>.
  *
- * @returns {Boolean}
+ * @returns {boolean}
  */
 Node.prototype.isLeaf = function () {
 	return false;

src/types/RedBlackTree.js

@@ -83,7 +83,7 @@ export default class RedBlackTree {
 	 * key.
 	 *
 	 * @param {any} key - The input key.
-	 * @returns {Boolean}
+	 * @returns {boolean}
 	 */
 	has(key) {
 		return this._search(key) !== null;
@@ -130,7 +130,7 @@ export default class RedBlackTree {
 	 * then return <code>true</code>. Return <code>false</code> otherwise.
 	 *
 	 * @param {any} key - The input key.
-	 * @returns {Boolean} - Whether the key existed in the tree before removal.
+	 * @returns {boolean} - Whether the key existed in the tree before removal.
 	 */
 	remove(key) {
 		const node = this._search(key);