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GH-45436: [Docs][Packaging][Linux] Update how to build .deb/.rpm (#45481)

### Rationale for this change

If we can build .deb/.rpm, we can debug .deb/.rpm build easily.

### What changes are included in this PR?

Update `dev/tasks/linux-packages/README.md`.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #45436

Lead-authored-by: Sutou Kouhei <kou@clear-code.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Co-authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>