fix doc, reported in modelcontextprotocol#1068 (modelcontextprotocol#1081)

Author: md42

docs/docs/learn/architecture.mdx

@@ -77,7 +77,7 @@ referred to as a "remote" MCP server.
 
 MCP consists of two layers:
 
-- **Data layer**: Defines the JSON-RPC based protocol for client-server communication, including lifecycle management, core primitives, such as tools, resources, and prompts, and notifications,
+- **Data layer**: Defines the JSON-RPC based protocol for client-server communication, including lifecycle management, core primitives, such as tools, resources, prompts and notifications.
 - **Transport layer**: Defines the communication mechanisms and channels that enable data exchange between clients and servers, including transport-specific connection establishment, message framing, and authorization.
 
 Conceptually the data layer is the inner layer, while the transport layer is the outer layer.