fix: missing document for ChatSection (#183)

* fix: missing document

* Create tough-parents-judge.md

.changeset/tough-parents-judge.md

@@ -0,0 +1,5 @@
+---
+'@llamaindex/chat-ui-docs': patch
+---
+
+fix: missing document for ChatSection

docs/chat-ui/core-components.mdx

@@ -34,6 +34,7 @@ interface ChatSectionProps {
 - **handler**: Chat handler from `useChat` or custom implementation
 - **className**: Custom CSS classes for styling
 - **children**: Custom layout (defaults to `ChatMessages` + `ChatInput`)
+- **autoOpenCanvas**: Automatically opens the `ChatCanvas` when artifacts are present
 
 ### Default Layout