I noticed that the locked message still references the FAQ. See example:
locked by Bill the Lizard♦ yesterday
This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions here. This question and its answers are frozen and cannot be changed. More info: FAQ.
Since the FAQ has been replaced by the Help Center, this message should provide a link there instead. Currently, the link actually takes you to the about page; even if it doesn't link to the help center, the text should probably be something like "More info: About Stack Overflow".