docs: Update provider docs page (#7463)

Author: jacoblee93

docs/core_docs/docs/integrations/platforms/index.mdx

@@ -11,13 +11,16 @@ LangChain integrates with many providers.
 
 These providers have standalone `@langchain/{provider}` packages for improved versioning, dependency management and testing.
 
+For specifics on how to use each package, look for their pages in the appropriate component docs section (e.g. [chat models](/docs/integrations/chat/)).
+
 - [Anthropic](https://www.npmjs.com/package/@langchain/anthropic)
+- [Cerebras](https://www.npmjs.com/package/@langchain/cerebras)
 - [Cloudflare](https://www.npmjs.com/package/@langchain/cloudflare)
 - [Cohere](https://www.npmjs.com/package/@langchain/cohere)
 - [Exa](https://www.npmjs.com/package/@langchain/exa)
 - [Google GenAI](https://www.npmjs.com/package/@langchain/google-genai)
 - [Google VertexAI](https://www.npmjs.com/package/@langchain/google-vertexai)
-- [Google VertexAI Web](https://www.npmjs.com/package/@langchain/google-vertexai-web)
+- [Google VertexAI (Web Environments)](https://www.npmjs.com/package/@langchain/google-vertexai-web)
 - [Groq](https://www.npmjs.com/package/@langchain/groq)
 - [MistralAI](https://www.npmjs.com/package/@langchain/mistralai)
 - [MongoDB](https://www.npmjs.com/package/@langchain/mongodb)