Clarify statement about reading validation set

week3/week3-Embeddings.ipynb

@@ -651,7 +651,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Now you should upload *validation* corpus to evaluate current solution."
+    "Now you should read *validation* corpus, located at `data/validation.tsv`. You will use it later to evaluate current solution."
    ]
   },
   {