PY: add missing qldoc

Author: erik-krogh

python/ql/lib/semmle/python/objects/Modules.qll

@@ -136,6 +136,7 @@ class PackageObjectInternal extends ModuleObjectInternal, TPackageObject {
   /** Gets the init module of this package */
   PythonModuleObjectInternal getInitModule() { result = TPythonModule(this.getSourceModule()) }
 
+  /** Holds if the folder for this package has no init module. */
   predicate hasNoInitModule() {
     exists(Folder f |
       f = this.getFolder() and