chore(doc-gen): only generate angular.io module and _data docs for public modules

Author: petebacondarwin

docs/angular.io-package/processors/addJadeDataDocsProcessor.js

@@ -35,7 +35,7 @@ module.exports = function addJadeDataDocsProcessor(EXPORT_DOC_TYPES) {
       */
 
       _.forEach(docs, function(doc) {
-        if (doc.docType === 'module' && doc.exports.length) {
+        if (doc.docType === 'module' && doc.public && doc.exports.length) {
           modules.push(doc);
 
           // GET DATA FOR INDEX PAGE OF MODULE SECTION