Rename terminal_max_retention_time to session_timeout

doc/ci/interactive_web_terminal/index.md

@@ -59,7 +59,7 @@ the terminal and type commands like a normal shell.
 
 If you have the terminal open and the job has finished with its tasks, the
 terminal will block the job from finishing for the duration configured in
-[`[session_server].terminal_max_retention_time`](https://docs.gitlab.com/runner/configuration/advanced-configuration.html#the-session_server-section) until you
+[`[session_server].session_timeout`](https://docs.gitlab.com/runner/configuration/advanced-configuration.html#the-session_server-section) until you
 close the terminal window.
 
 ![finished job with terminal open](img/finished_job_with_terminal_open.png)