chore(doc-gen): move @publicModule tag-def to base package

This prevents unwanted "unknown tag" warnings when generating the non-public docs.

docs/public-docs-package/index.js

@@ -6,10 +6,6 @@ module.exports = new Package('angular-public', [basePackage])
 
 .processor(require('./processors/filterPublicDocs'))
 
-.config(function(parseTagsProcessor) {
-  parseTagsProcessor.tagDefinitions.push({ name: 'publicModule' });
-})
-
 .config(function(processClassDocs, filterPublicDocs, EXPORT_DOC_TYPES) {
   processClassDocs.ignorePrivateMembers = true;
   filterPublicDocs.docTypes = EXPORT_DOC_TYPES;