Fix java docs build for real (#7171)

Previous pr used wrong directory after all

Signed-off-by: Robert Kruszewski <github@robertk.io>

Author: robert3005

.github/workflows/docs.yml

@@ -49,7 +49,7 @@ jobs:
           mkdir -p docs/_static/vortex-jni
           mkdir -p docs/_static/vortex-spark
           cp -r java/vortex-jni/build/docs/javadoc/* docs/_static/vortex-jni/
-          cp -r java/vortex-spark_2.13/build/docs/javadoc/* docs/_static/vortex-spark/
+          cp -r vortex-spark/build/vortex-spark_2.13/docs/javadoc/* docs/_static/vortex-spark/
       - name: build Python and Rust docs
         run: |
           uv run --all-packages make -C docs html