PostgreSQL source distribution files

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/14/tutorial-sql-intro.html
Description:

Section 2.1:
https://www.postgresql.org/docs/current/tutorial-sql-intro.html

"Examples in this manual can also be found in the PostgreSQL source
distribution in the directory src/tutorial/. (Binary distributions of
PostgreSQL might not provide those files.)"

A link to those files (https://www.postgresql.org/ftp/source/) would be
beneficial.