chore: clarify usage of setup-java in ci workflow (#382)

Signed-off-by: Travis Truman <[email protected]>
Co-authored-by: Ben Cotton <[email protected]>

Author: trumant

.github/workflows/oscal-check.yaml

@@ -36,7 +36,7 @@ jobs:
           check-latest: true
           cache: true
 
-      - name: Setup Java
+      - name: Setup Java # this is here because oscal-cli-action below needs a java runtime
         uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165
         id: setup-java
         with: