add experimental note to elicitation documentation

Author: bhosmer-ant

docs/specification/draft/client/elicitation.mdx

@@ -4,6 +4,10 @@ title: Elicitation
 
 <Info>**Protocol Revision**: draft</Info>
 
+<Note>
+Note: the elicitation feature is experimental, and may change in future versions of the protocol.
+</Note>
+
 The Model Context Protocol (MCP) provides a standardized way for servers to request additional
 information from users through the client during interactions. This flow allows clients to
 maintain control over user interactions and data sharing while enabling servers to gather