Clean up references to the interface.

base.go

@@ -44,10 +44,8 @@ type Namer interface {
 //
 //	req := jrpc2.InboundRequest(ctx)
 //
-// The latter is primarily useful for handlers generated by handler.New,
-// which do not receive the request directly. For a handler that implements
-// the Handle method directly, req is the same value passed as a parameter
-// to Handle.
+// The latter is primarily useful for wrappers generated by handler.New, which
+// do not receive the request directly.
 type Handler = func(context.Context, *Request) (any, error)
 
 // A Request is a request message from a client to a server.