doc: Update interactive web terminal wording

Adds phrase "debugging with SSH" for SEO purposes

doc/ci/interactive_web_terminal/index.md

@@ -10,7 +10,7 @@ type: reference
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/50144) in GitLab 11.3.
 
 Interactive web terminals give the user access to a terminal in GitLab for
-running one-off commands for their CI pipeline. Since this is giving the user
+running one-off commands for their CI pipeline, enabling debugging with SSH. Since this is giving the user
 shell access to the environment where [GitLab Runner](https://docs.gitlab.com/runner/)
 is deployed, some [security precautions](../../administration/integration/terminal.md#security) were
 taken to protect the users.