URL had moved refs #561

Author: JJ

doc/Type/Lock.pod6

@@ -106,7 +106,7 @@ method condition(Lock:D: --> ConditionVariable:D)
 =end code
 
 Returns a condition variable. Compare
-L<http://web.stanford.edu/class/cs140/cgi-bin/lecture.php?topic=locks> or
+L<https://web.stanford.edu/~ouster/cgi-bin/cs140-spring14/lecture.php?topic=locks> or
 L<https://en.wikipedia.org/wiki/Monitor_%28synchronization%29> for background.
 
     my $l = Lock.new;