java: remove some comment noise

Change-Id: I4d15a0e606f468346bc5d2f43af2e14bcc758e13
Reviewed-on: https://gerrit.libreoffice.org/13405
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>