chore(doc-gen): only clone docs that are actually being re-exported to a new module

Closes #1353

docs/dgeni-package/processors/cloneExportedFromDocs.js

@@ -20,12 +20,14 @@ module.exports = function cloneExportedFromDocs(modules, EXPORT_DOC_TYPES) {
                             'Referenced in "@exportedAs" tag on class: "' + doc.moduleDoc.id + '/' + doc.name + '"');
           } else {
 
+            if(exportedAsModule !== doc.moduleDoc) {
               // Add a clone of export to its "exportedAs" module
               var clonedDoc = _.clone(doc);
               clonedDoc.moduleDoc = exportedAsModule;
               exportedAsModule.exports.push(clonedDoc);
               extraPublicDocs.push(clonedDoc);
             }
+          }
         });
       });