Fix documentation on the scope of PAT for GitLab plugin for JetBrains IDE

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Summary

We mention using the PAT scope ai_features here to address a JetBrains security vulnerability, but starting from this MR, we updated the configuration steps to use the api scope of PAT and this was subsequently ported over to the documentation.

It was noted from a test 5 months ago that there were some issues with using the PAT scope ai_features: gitlab-org/editor-extensions/gitlab-jetbrains-plugin!447 (comment 1958848396). We may need to make some tests to confirm if there are still issues before updating the documentation back to ai_features scope for JetBrains IDE.