Remove resume-specific docs from create-side SessionConfig

Addresses review feedback on PR #1323: the create-session API docs for
enable_on_demand_instruction_discovery / EnableOnDemandInstructionDiscovery
should not include resume-specific behavior. That note already lives on
the resume-side configs (Python resume_session and Go ResumeSessionConfig).

Author: Tomas Meszaros

go/types.go

@@ -610,8 +610,6 @@ type SessionConfig struct {
 	// repositories or workspaces; discovered instruction files may be stored or
 	// replayed with session history. When nil (the default), the option is
 	// omitted from the wire payload and the runtime treats the setting as off.
-	// For resumed sessions, omitting this option leaves the existing session
-	// setting unchanged; pass Bool(false) to disable future on-demand discovery.
 	EnableOnDemandInstructionDiscovery *bool
 	// Tools exposes caller-implemented tools to the CLI. A Tool with a nil Handler
 	// is declaration-only; the consumer must resolve its calls via pending tool RPCs.

python/copilot/client.py

@@ -1424,9 +1424,7 @@ async def create_session(
                 connected runtime supports and enables on-demand custom instruction
                 discovery. Enable only for trusted repositories or workspaces;
                 discovered instruction files may be stored or replayed with session
-                history. For resumed sessions, omitting this option leaves the
-                existing session setting unchanged; pass False to disable future
-                on-demand discovery.
+                history.
             skill_directories: Directories to search for skills.
             instruction_directories: Additional directories to search for custom
                 instruction files.