Update .github/workflows/r.yml

Author: wjones127

.github/workflows/r.yml

@@ -297,7 +297,7 @@ jobs:
             https://dl.min.io/server/minio/release/windows-amd64/archive/minio.RELEASE.2022-05-26T05-48-41Z
           chmod +x "$HOME/.local/bin/minio.exe"
           echo "$HOME/.local/bin" >> $GITHUB_PATH
-      # TODO: figure out why the GCS tests are hanging
+      # TODO(ARROW-17149): figure out why the GCS tests are hanging on Windows
       # - name: Install Google Cloud Storage Testbench
       #   shell: bash
       #   run: ci/scripts/install_gcs_testbench.sh default