Book SUMMARY.md: Fix part titles according to mdbook (#2463)

mdBook requires part titles to be H1, not any other heading level.

Format documentation on `SUMMARY.md` shows using H1 (one `#`):
220cb4f0c8/guide/src/format/summary.md

Parser code specifically looks for H1:
220cb4f0c8/src/book/summary.rs (L268)
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Joe Taber 2024-01-31 17:12:36 -06:00 committed by GitHub
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@ -56,13 +56,13 @@
- [Access Control](access_control/intro.md)
## Support
# Support
- [Troubleshooting](troubleshooting.md)
- [Frequently Asked Questions](frequently_asked_questions.md)
- [Glossary of Technical Terms](glossary.md)
## For Developers
# For Developers
- [Developer Guide](DEVELOPER_README.md)
- [FAQ](developers/faq.md)