docs: update stage from Create to AI Coding

Uma Chandranrequested to merge
uc/update-stage-for-docs into main

Description

Updates the docs script to reflect the move to the AI Coding stage.

Related issues and merge requests

Update stage/group metadata in doc files to ref... (gitlab-org/technical-writing/team-tasks#1685)

Documentation

If this MR adds or updates CLI command documentation, follow the conventions in the GitLab CLI (glab) documentation style guide, run make gen-docs, and commit the updated files in docs/source/.

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