Fix a couple of ambiguities around "client" vs. "host"

Author: jspahrsummers

docs/specification/architecture/_index.md

@@ -52,13 +52,15 @@ The host process acts as the container and coordinator:
 - Manages context aggregation across clients
 
 ### Clients
-Each client maintains an isolated server connection:
+Each client is created by the host and maintains an isolated server connection:
 - Establishes one stateful session per server
 - Handles protocol negotiation and capability exchange
 - Routes protocol messages bidirectionally
 - Manages subscriptions and notifications
 - Maintains security boundaries between servers
 
+A host application creates and manages multiple clients, with each client having a 1:1 relationship with a particular server.
+
 ### Servers
 Servers provide specialized context and capabilities:
 - Expose resources, tools and prompts via MCP primitives

docs/specification/server/resources.md

@@ -12,7 +12,7 @@ The Model Context Protocol (MCP) provides a standardized way for servers to expo
 
 ## User Interaction Model
 
-Resources in MCP are designed to be **application-driven**, with clients determining how to incorporate context based on their needs.
+Resources in MCP are designed to be **application-driven**, with host applications determining how to incorporate context based on their needs.
 
 For example, applications could:
 * Expose resources through UI elements for explicit selection, in a tree or list view