docs: weaviate docs (#20042)

docs/docs/integrations/providers/weaviate.mdx

@@ -21,7 +21,7 @@ What is `Weaviate`?
 Install the Python SDK:
 
 ```bash
-pip install weaviate-client
+pip install langchain-weaviate
 ```
 
 
@@ -32,7 +32,7 @@ whether for semantic search or example selection.
 
 To import this vectorstore:
 ```python
-from langchain_community.vectorstores import Weaviate
+from langchain_weaviate import WeaviateVectorStore
 ```
 
 For a more detailed walkthrough of the Weaviate wrapper, see [this notebook](/docs/integrations/vectorstores/weaviate)