Fix links to external types in javadoc #19581
                
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Hi,
I took the freedom to add trailing slashes to the Javadoc links again as MJAVADOC-532 seems to be fixed and the current redirects for the Spring-Framework docs seem to not work. See #19573 for more information.
The PR is already targeting 2.1.x - hope that's okay.
Cheers,
Christoph