update qdrant docs to reflect the proper way to initialize Qdrant() constructor (#4596)

# update qdrant docs to reflect the proper way to initialize Qdrant()
constructor

The [Qdrant
docs](https://python.langchain.com/en/latest/modules/indexes/vectorstores/examples/qdrant.html)
still contain an old reference for passing an `embedding_function` into
the constructor. This is no longer supported.

This PR updates the docs to reflect the proper way to initialize
`Qdrant()`

Old:
![Screenshot 2023-05-12 at 3 06 33
PM](https://github.com/hwchase17/langchain/assets/1552962/dd4063d2-2a07-4340-91bb-e305f7215ddd)

New:
![Screenshot 2023-05-12 at 3 21 09
PM](https://github.com/hwchase17/langchain/assets/1552962/aebc3f63-1a8b-4ca3-93c0-a2ce30dcd282)

docs/modules/indexes/vectorstores/examples/qdrant.ipynb

@@ -274,7 +274,7 @@
     ")\n",
     "qdrant = Qdrant(\n",
     "    client=client, collection_name=\"my_documents\", \n",
-    "    embedding_function=embeddings.embed_query\n",
+    "    embeddings=embeddings\n",
     ")"
    ]
   },