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Refactoring a method parameter name does not change the javadoc comments on that method. It should change existing @param elements to whatever the new method names are. This ought to be a relatively simple fix. Down the road, perhaps refactoring a parameter name could also search existing javadoc comments in that project for references to that parameter and change them as well. It would need a preview mode, much like refactoring the name of a non-private method.
Have you checked 'Apply rename on Comments' checkbox in refactoring rename?
That option doesn't exist for the "instant rename" feature, which is what comes up when you attempt to refactor a method parameter name. "Instant rename" should also instantly rename the @param elements instead of leaving you with code that generates two javadoc warnings.
I see, then it's duplicate of issue 102669 *** This issue has been marked as a duplicate of 102669 ***