TST: Fix grammar in notebook GHA workflow file comment

Fix grammar in notebook GHA workflow file comment.

Author: jhlegarreta

.github/workflows/notebooks.yml

@@ -41,7 +41,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Download data file from OSF
+      - name: Download data from OSF
         run: |
           mkdir ${TEST_DATA_HOME}
           pip install osfclient