Update kernel docs github actions to publish kernelDefaults java docs

Merged into my personal fork and successfully published default docs here https://allisonport-db.github.io/delta/snapshot/kernel-defaults/java/
https://github.com/allisonport-db/delta/actions/runs/6450710871

GitOrigin-RevId: e453ae9f2d6388fbbc3f57cfb4e55086e84a5003

.github/workflows/kernel_docs.yaml

@@ -34,9 +34,11 @@ jobs:
           java-version: "8"
       - name: Generate docs
         run: |
-          build/sbt kernelApi/unidoc
+          build/sbt kernelGroup/unidoc
           mkdir -p kernel/docs/snapshot/kernel-api/java
+          mkdir -p kernel/docs/snapshot/kernel-defaults/java
           cp -r kernel/kernel-api/target/javaunidoc/. kernel/docs/snapshot/kernel-api/java/
+          cp -r kernel/kernel-defaults/target/javaunidoc/. kernel/docs/snapshot/kernel-defaults/java/
       - name: Setup Pages
         uses: actions/configure-pages@v3
       - name: Upload artifact
@@ -46,4 +48,4 @@ jobs:
           path: kernel/docs
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v2