Bug#1056779: derby-doc: some javadoc missing from derby-doc

[tony mancill]

Package: derby-doc
Severity: normal

I noticed during the preparation of 10.14.2.0-3 that the javadoc
installed in the derby-doc binary package is much less than what is
provided in 10.14.2.0-2.

This must be due to some change in the toolchain, since rebuilding
10.14.2.0-2 against sid, trixie, or bookworm results in the same
discrepancy.