chore: update developer guide links in _index.md (#23372)#23373

ti-chi-bot[bot] merged 3 commits into

pingcap:release-8.5pingcap/docs:release-8.5from

ti-chi-bot:cherry-pick-23372-to-release-8.5ti-chi-bot/docs:cherry-pick-23372-to-release-8.5Copy head branch name to clipboard