go/doc: added the predeclared identifiers clear, min, max

Fixes: #68028

Change-Id: Ib341b9f57b001cccc5dc9e822b7feaabcdb77e63
GitHub-Last-Rev: 8dd3467016
GitHub-Pull-Request: golang/go#68029
Reviewed-on: https://go-review.googlesource.com/c/go/+/593015
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Robert Griesemer <gri@google.com>

src/go/doc/reader.go

@@ -958,6 +958,7 @@ var predeclaredTypes = map[string]bool{
 var predeclaredFuncs = map[string]bool{
 	"append":  true,
 	"cap":     true,
+	"clear":   true,
 	"close":   true,
 	"complex": true,
 	"copy":    true,
@@ -965,6 +966,8 @@ var predeclaredFuncs = map[string]bool{
 	"imag":    true,
 	"len":     true,
 	"make":    true,
+	"max":     true,
+	"min":     true,
 	"new":     true,
 	"panic":   true,
 	"print":   true,