slog: document that TextHandler uses strconv.Quote

Change-Id: I320b405945bf1c47140e99736af0066e688acdf9
Reviewed-on: https://go-review.googlesource.com/c/exp/+/443159
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
diff --git a/slog/text_handler.go b/slog/text_handler.go
index 5f66b24..7459860 100644
--- a/slog/text_handler.go
+++ b/slog/text_handler.go
@@ -73,8 +73,8 @@
 // If a value implements [encoding.TextMarshaler], the result of MarshalText is
 // written. Otherwise, the result of fmt.Sprint is written.
 //
-// Keys and values are quoted if they contain Unicode space characters,
-// non-printing characters, '"' or '='.
+// Keys and values are quoted with [strconv.Quote] if they contain Unicode space
+// characters, non-printing characters, '"' or '='.
 //
 // Keys inside groups consist of components (keys or group names)
 // separated by the Unicode middle dot character, '·'. No further escaping is