docs: Update Vector Store docs formatting (#30359)

Description: Fix formatting in Vector Stores docs.

- astradb: fix API ref spacing
- milvus, pgvector, pinecone, qdrant: removed % in cmds for docs
consistency
- pgvector: removed redundant code and reorganized imports

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

docs/docs/integrations/vectorstores/astradb.ipynb

@@ -505,7 +505,7 @@
    "source": [
     "## API reference\n",
     "\n",
-    "For detailed documentation of all `AstraDBVectorStore` features and configurations head to the API reference:https://python.langchain.com/api_reference/astradb/vectorstores/langchain_astradb.vectorstores.AstraDBVectorStore.html"
+    "For detailed documentation of all `AstraDBVectorStore` features and configurations head to the API reference: https://python.langchain.com/api_reference/astradb/vectorstores/langchain_astradb.vectorstores.AstraDBVectorStore.html"
    ]
   }
  ],

docs/docs/integrations/vectorstores/milvus.ipynb

@@ -36,7 +36,7 @@
     }
    ],
    "source": [
-    "%pip install -qU langchain_milvus"
+    "pip install -qU langchain_milvus"
    ]
   },
   {

docs/docs/integrations/vectorstores/pgvector.ipynb

@@ -113,22 +113,19 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "id": "979a65bd-742f-4b0d-be1e-c0baae245ec6",
    "metadata": {
     "tags": []
    },
    "outputs": [],
    "source": [
-    "from langchain_core.documents import Document\n",
     "from langchain_postgres import PGVector\n",
-    "from langchain_postgres.vectorstores import PGVector\n",
     "\n",
     "# See docker command above to launch a postgres instance with pgvector enabled.\n",
     "connection = \"postgresql+psycopg://langchain:langchain@localhost:6024/langchain\"  # Uses psycopg3!\n",
     "collection_name = \"my_docs\"\n",
     "\n",
-    "\n",
     "vector_store = PGVector(\n",
     "    embeddings=embeddings,\n",
     "    collection_name=collection_name,\n",
@@ -169,6 +166,8 @@
     }
    ],
    "source": [
+    "from langchain_core.documents import Document\n",
+    "\n",
     "docs = [\n",
     "    Document(\n",
     "        page_content=\"there are cats in the pond\",\n",

docs/docs/integrations/vectorstores/pinecone.ipynb

@@ -26,7 +26,7 @@
    },
    "outputs": [],
    "source": [
-    "%pip install -qU langchain-pinecone pinecone-notebooks"
+    "pip install -qU langchain-pinecone pinecone-notebooks"
    ]
   },
   {
@@ -56,7 +56,6 @@
    "source": [
     "import getpass\n",
     "import os\n",
-    "import time\n",
     "\n",
     "from pinecone import Pinecone, ServerlessSpec\n",
     "\n",

docs/docs/integrations/vectorstores/qdrant.ipynb

@@ -32,7 +32,7 @@
    },
    "outputs": [],
    "source": [
-    "%pip install -qU langchain-qdrant"
+    "pip install -qU langchain-qdrant"
    ]
   },
   {