BUG #18476: Debian Install Docs have confusing code block structure

The following bug has been logged on the website:

Bug reference:      18476
Logged by:          Matthias Hörmann
Email address:      matthias.hoermann@saltation.com
PostgreSQL version: 16.3
Operating system:   Debian Linux
Description:

On https://www.postgresql.org/download/linux/debian/ the commands to
manually install the repository and the commands to install packages from
the repository are in one big code block and the text before it suggests
that this code block is optional if you use the script above it. However the
script (without parameters at least) only installs the repository, not the
packages from the repository. Maybe two code blocks were accidentally merged
here and the text in between deleted?