docs: update the list of providers (langchain-ai#19012)

**Description:** Update the list of LangChain providers
**Issue:** Make the list of LangChain providers current
**Dependencies:** None

docs/docs/integrations/platforms/index.mdx

@@ -12,13 +12,17 @@ LangChain integrates with many providers.
 These providers have standalone `langchain-{provider}` packages for improved versioning, dependency management and testing.
 
 - [AI21](/docs/integrations/providers/ai21)
+- [Airbyte](/docs/integrations/providers/airbyte)
 - [Anthropic](/docs/integrations/platforms/anthropic)
 - [Astra DB](/docs/integrations/providers/astradb)
+- [Elasticsearch](/docs/integrations/providers/elasticsearch)
 - [Exa Search](/docs/integrations/providers/exa_search)
+- [Fireworks](/docs/integrations/providers/fireworks)
 - [Google](/docs/integrations/platforms/google)
 - [Groq](/docs/integrations/providers/groq)
 - [IBM](/docs/integrations/providers/ibm)
 - [MistralAI](/docs/integrations/providers/mistralai)
+- [MongoDB](/docs/integrations/providers/mongodb_atlas)
 - [Nomic](/docs/integrations/providers/nomic)
 - [Nvidia](/docs/integrations/providers/nvidia)
 - [OpenAI](/docs/integrations/platforms/openai)