Fix typo in comments.

Former-commit-id: 0aa7dc07f19420e5c5faa63fa9c3637a683f7b73

AtlasTest/TestTools/share/post.sh

@@ -172,7 +172,7 @@ else
        # to handling the versioning manually.
        # ATLAS_REFERENCE_TAG should be a string of the form PACKAGE/VERSION.
        # We first look for it in DATAPATH.  If we don't find it,
-       # we then look under ATLAS_REFERENCE_TAG, which falls back
+       # we then look under ATLAS_REFERENCE_DATA, which falls back
        # to an afs path if it's not found.
        if [ \( ! -r $reflog \) -a "$ATLAS_REFERENCE_TAG" != "" ]; then
            # Look for the file in DATAPATH.