[KYUUBI #7222] [DOC] Fix "document isn't included in any toctree" warnings

### Why are the changes needed?

The PR fixes a few `document isn't included in any toctree` issues:

* Page `JVM Quake Support` now included into `Extensions for Spark` menu:
  ```shell
  ./kyuubi/docs/extensions/engines/spark/jvm-quake.md: WARNING: document isn't included in any toctree
  ```

* Page `Z-order Benchmark` consolidated with `Z-Ordering Support` page:
  ```shell
  ./kyuubi/docs/extensions/engines/spark/z-order-benchmark.md: WARNING: document isn't included in any toctree
  ```

* File `requirements.txt` added to `exclude_patterns`:
  ```shell
  ./kyuubi/docs/requirements.txt: WARNING: document isn't included in any toctree
  ```

### How was this patch tested?

Checked that there are no warnings mentioned above during the documentation build process.
```shell
make html
```

### Was this patch authored or co-authored using generative AI tooling?

No

Closes #7222 from dnskr/doc-fix-document-isn't-included-in-any-toctree.

Closes #7222

cf7fb1f [dnskr] [DOC] Fix "document isn't included in any toctree" warnings

Authored-by: dnskr <dnskrv88@gmail.com>
Signed-off-by: dnskr <dnskrv88@gmail.com>

Author: dnskr

docs/conf.py

@@ -92,7 +92,7 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+exclude_patterns = ['requirements.txt', '_build', 'Thumbs.db', '.DS_Store']
 
 # -- Options for HTML output -------------------------------------------------
 

docs/extensions/engines/spark/index.rst

@@ -26,3 +26,4 @@ Extensions for Spark
     ../../../connector/spark/index
     lineage
     jdbc-dialect
+    jvm-quake