### Why are the changes needed?
The PR fixes `nonexisting document` issues:
```shell
./kyuubi/docs/client/advanced/features/index.rst:19: WARNING: toctree contains reference to nonexisting document 'client/advanced/features/engine_resources' [toc.not_readable]
./kyuubi/docs/client/odbc/index.rst:20: WARNING: toctree contains reference to nonexisting document 'client/odbc/todo' [toc.not_readable]
./kyuubi/docs/client/thrift/index.rst:20: WARNING: toctree contains reference to nonexisting document 'client/thrift/hive_beeline' [toc.not_readable]
./kyuubi/docs/index.rst:189: WARNING: toctree contains reference to nonexisting document 'sql/index' [toc.not_readable]
./kyuubi/docs/quick_start/index.rst:23: WARNING: toctree contains reference to nonexisting document 'quick_start/quick_start_with_beeline' [toc.not_readable]
```
### How was this patch tested?
Checked that there are no `nonexisting document` warnings during the documentation build process.
```shell
make html
```
### Was this patch authored or co-authored using generative AI tooling?
No
Closes#6970 from dnskr/doc-fix-nonexisting-document.
Closes#6970
a7c2b3617 [dnskr] [DOC] Fix "nonexisting document" issues
Authored-by: dnskr <dnskrv88@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>
85caea86df