# 🔍 Description
## Issue References 🔗
As descirbed.
## Describe Your Solution 🔧
- Replace the placeholder for default value of un-preset configs on doc page, changed from `<undefined>` to `(none)`
- The `(none)` placeholder style is also used in the docs of
- Spark : https://spark.apache.org/docs/latest/configuration.html
- Flink : https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/config/
- Trino (as `NONE`): https://trino.io/docs/current/admin/properties.html
- Only affects the config doc page, no functional changes.
## Types of changes 🔖
- [ ] Bugfix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
## Test Plan 🧪
#### Behavior Without This Pull Request ⚰️
No functional changes.
Config doc page:
#### Behavior With This Pull Request 🎉
No functional changes.
Config doc page:
#### Related Unit Tests
---
# Checklists
## 📝 Author Self Checklist
- [x] My code follows the [style guidelines](https://kyuubi.readthedocs.io/en/master/contributing/code/style.html) of this project
- [x] I have performed a self-review
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my feature works
- [x] New and existing unit tests pass locally with my changes
- [x] This patch was not authored or co-authored using [Generative Tooling](https://www.apache.org/legal/generative-tooling.html)
## 📝 Committer Pre-Merge Checklist
- [ ] Pull request title is okay.
- [ ] No license issues.
- [ ] Milestone correctly set?
- [ ] Test coverage is ok
- [ ] Assignees are selected.
- [ ] Minimum number of approvals
- [ ] No changes are requested
**Be nice. Be informative.**
Closes#5916 from bowenliang123/none-ph.
Closes#5916
3b141dd61 [Bowen Liang] update test
04cf8cd2a [Bowen Liang] Use "(none)" placeholder for default value of unset configs on config page
Authored-by: Bowen Liang <liangbowen@gf.com.cn>
Signed-off-by: Bowen Liang <liangbowen@gf.com.cn>
0f8edb2b2f