xmerge: javadoc <code>..</code> fix

Change-Id: Ic918df2ed1e4faff770107d92a75e32b51a91ddf
Reviewed-on: https://gerrit.libreoffice.org/10689
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>