Update client.go

Co-authored-by: Blake Gentry <bgentry@users.noreply.github.com>

Author: brandur

client.go

@@ -2744,7 +2744,7 @@ func defaultClientIDWithHost(startedAt time.Time, host string) string {
 // comparatively because any new options must also be considered here for things
 // to work.
 //
-// This is a function instance of an instance function so that it doesn't have
+// This is an unexported function in `river` so that it doesn't have
 // to be exported from `rivertype` and doesn't become part of the public API.
 func uniqueOptsIsEmpty(opts *rivertype.UniqueOpts) bool {
 	return !opts.ByArgs &&