Use newer gdb startup message

Review Request #827 — Created July 23, 2021 and submitted — Latest diff uploaded

Information

pidgin/nest
default
d6273b62bbcc

Reviewers

The debugging documentation showcased a very old example of the message you see
when starting gdb. This commit updates the example message to the way it looks
in a newer version of gdb (v10.1.90).

Ran dev-server.sh and verified content looked as intended.