update docblock

...for typechecking.

src/browser/dom/DOMChildrenOperations.js

@@ -57,18 +57,24 @@ function insertChildAt(parentNode, childNode, index) {
   }
 }
 
-/**
- * Sets the text content of `node` to `text`.
- *
- * @param {DOMElement} node Node to change
- * @param {string} text New text content
- */
 var updateTextContent;
 if (textContentAccessor === 'textContent') {
+  /**
+   * Sets the text content of `node` to `text`.
+   *
+   * @param {DOMElement} node Node to change
+   * @param {string} text New text content
+   */
   updateTextContent = function(node, text) {
     node.textContent = text;
   };
 } else {
+  /**
+   * Sets the text content of `node` to `text`.
+   *
+   * @param {DOMElement} node Node to change
+   * @param {string} text New text content
+   */
   updateTextContent = function(node, text) {
     // In order to preserve newlines correctly, we can't use .innerText to set
     // the contents (see #1080), so we empty the element then append a text node