engine: add some extra keywords for finding the debug section

I forgot where we documented this, and ChatGPT wasn't able to provide
the link, so I asked it to suggest improvements for it to discover the
page :)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

content/manuals/engine/daemon/logs.md

@@ -1,7 +1,7 @@
 ---
 title: Read the daemon logs
-description: How to read the event logs for the Docker daemon
-keywords: docker, daemon, configuration, troubleshooting, logging
+description: How to read Docker daemon logs and force a stack trace using SIGUSR1 for debugging
+keywords: docker, daemon, configuration, troubleshooting, logging, debug, stack trace, SIGUSR1, signal, goroutine dump, crash diagnostics
 aliases:
   - /config/daemon/logs/
 ---