Update js-yaml calls in docgen script (#4618)

* Fix js-yaml method

* Fix another call

Author: hsubox76

scripts/docgen/generate-docs.js

@@ -133,7 +133,7 @@ let tocText = '';
  * @param {string} homeRaw
  */
 function generateTempHomeMdFile(tocRaw, homeRaw) {
-  const { toc } = yaml.safeLoad(tocRaw);
+  const { toc } = yaml.load(tocRaw);
   let tocPageLines = [homeRaw, '# API Reference'];
   toc.forEach(group => {
     tocPageLines.push(`\n## [${group.title}](${stripPath(group.path)}.html)`);
@@ -259,7 +259,7 @@ function writeGeneratedFileList(htmlFiles) {
       path: `${devsitePath}${filename}`
     };
   });
-  const generatedTocYAML = yaml.safeDump({ toc: fileList });
+  const generatedTocYAML = yaml.dump({ toc: fileList });
   return fs
     .writeFile(`${docPath}/_toc_autogenerated.yaml`, generatedTocYAML)
     .then(() => htmlFiles);