Javadoc fixes

[J Ross Nicoll <jr...@dcs.st-and.ac.uk>]

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Just started looking over the Velocity source code, and noticed a lot of
Javadoc warnings. I've attached a patch against SVN revision 348987,
which fixes a lot of the simpler problems. Found three general types of
problem:

@param followed by parameter type, rather than name.
@see followed by a URL, rather than a package/class/method reference.
@return on methods without a return value (constructors and methods that
return void)

If someone could check and apply the patch to the SVN version, would be
appreciated. I'll work on getting the rest of the warnings fixed later...
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