log/slog: correct doc examples for Handler.WithGroup

Fixes #64519

Change-Id: Iaea5de74402b77eb5a42979bd3baa1276b13d585
GitHub-Last-Rev: 5080a25
GitHub-Pull-Request: #64551
Reviewed-on: https://go-review.googlesource.com/c/go/+/547215
Reviewed-by: Bryan Mills <[email protected]>
Reviewed-by: Jonathan Amsterdam <[email protected]>
Run-TryBot: Jes Cok <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: callthingsoff

src/log/slog/handler.go

@@ -76,11 +76,11 @@ type Handler interface {
 	// A Handler should treat WithGroup as starting a Group of Attrs that ends
 	// at the end of the log event. That is,
 	//
-	//     logger.WithGroup("s").LogAttrs(level, msg, slog.Int("a", 1), slog.Int("b", 2))
+	//     logger.WithGroup("s").LogAttrs(ctx, level, msg, slog.Int("a", 1), slog.Int("b", 2))
 	//
 	// should behave like
 	//
-	//     logger.LogAttrs(level, msg, slog.Group("s", slog.Int("a", 1), slog.Int("b", 2)))
+	//     logger.LogAttrs(ctx, level, msg, slog.Group("s", slog.Int("a", 1), slog.Int("b", 2)))
 	//
 	// If the name is empty, WithGroup returns the receiver.
 	WithGroup(name string) Handler