Clarify insights access (#1549)

Author: tanushree-sharma

src/langsmith/insights.mdx

@@ -6,6 +6,10 @@ sidebarTitle: Insights
 The Insights Agent automatically analyzes your traces to detect usage patterns, common agent behaviors and failure modes — without requiring you to manually review thousands of traces.
 Insights uses hierarchical categorization to make sense of your data and highlight actionable trends.
 
+<Note>
+Insights is available for LangSmith Plus and Enterprise [plans](https://www.langchain.com/pricing) and is only available for LangSmith SaaS deployments.
+</Note>
+
 ## Prerequisites
 
 - An OpenAI API key (generate one [here](https://platform.openai.com/account/api-keys)) or an Anthropic API key (generate one [here](https://console.anthropic.com/settings/keys))