Error on 6.4 Errata page

[schwack]

On: 

https://www.openbsd.org/errata64.html

line 9: 

<link rel="canonical" href="https://www.openbsd.org/errata63.html";> 

should be:

<link rel="canonical" href="https://www.openbsd.org/errata64.html";>