docs: Qdrant partner package reference (#21649)

## Description:
As the title goes.

docs/docs/integrations/platforms/index.mdx

@@ -36,6 +36,7 @@ These providers have standalone `langchain-{provider}` packages for improved ver
 - [Nvidia](/docs/integrations/providers/nvidia)
 - [OpenAI](/docs/integrations/platforms/openai)
 - [Pinecone](/docs/integrations/providers/pinecone)
+- [Qdrant](/docs/integrations/providers/qdrant)
 - [Robocorp](/docs/integrations/providers/robocorp)
 - [Together AI](/docs/integrations/providers/together)
 - [Upstage](/docs/integrations/providers/upstage)

docs/docs/integrations/providers/qdrant.mdx

@@ -7,10 +7,10 @@
 
 ## Installation and Setup
 
-Install the Python SDK:
+Install the Python partner package:
 
 ```bash
-pip install qdrant-client
+pip install langchain-qdrant
 ```
 
 
@@ -21,7 +21,7 @@ whether for semantic search or example selection.
 
 To import this vectorstore:
 ```python
-from langchain_community.vectorstores import Qdrant
+from langchain_qdrant import Qdrant
 ```
 
 For a more detailed walkthrough of the Qdrant wrapper, see [this notebook](/docs/integrations/vectorstores/qdrant)