Fix castor website [SPR-10189]

[spring-projects-issues]

Luca Preziati opened SPR-10189 and commented

The links to castor site are castor.org, but the site I think it's moved to castor.codehaus.org.

Fix docmentantion link. The castor.codehaur.org site is not all fixed. Also castor site have many link broken, I just have a bug on its jira.

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Backported to: 3.1.4

[spring-projects-issues]

Chris Beams commented

Fixed – thanks, Luca!