Added a comment for getBeanIdentifier()

Co-authored-by: Chris Smowton <smowton@github.com>

java/ql/src/experimental/Security/CWE/CWE-502/UnsafeSpringExporterInConfigurationClass.ql

@@ -47,6 +47,9 @@ private class UnsafeBeanInitMethod extends Method {
     )
   }
 
+  /**
+   * Gets this bean's name if given by the `Bean` annotation, or this method's identifier otherwise.
+   */
   string getBeanIdentifier() { result = identifier }
 }