Add note in the lfs check action to help contributors fix Git LFS che…

…ck failure. (microsoft#2563)

* Add note in the lfs check action.

* Update lfs-check.yml

.github/workflows/lfs-check.yml

@@ -10,6 +10,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           lfs: true
-      - name: Check Git LFS files for consistency
+      - name: "Check Git LFS files for consistency, if you see error like 'pointer: unexpectedGitObject ... should have been a pointer but was not', please install Git LFS locally, delete the problematic file, and then add it back again. This ensures it's properly tracked."
         run: |
           git lfs fsck