runtime, unicode: use consistent banner for generated code

Per golang.org/s/generatedcode

Updates #nnn

Change-Id: Ia7513ef6bd26c20b62b57b29f7770684a315d389
Reviewed-on: https://go-review.googlesource.com/45470
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/duff_386.s

-// AUTO-GENERATED by mkduff.go
+// Code generated by mkduff.go; DO NOT EDIT.
 // Run go generate from src/runtime to update.
 // See mkduff.go for comments.
 

src/runtime/duff_amd64.s

-// AUTO-GENERATED by mkduff.go
+// Code generated by mkduff.go; DO NOT EDIT.
 // Run go generate from src/runtime to update.
 // See mkduff.go for comments.
 

src/runtime/duff_arm.s

-// AUTO-GENERATED by mkduff.go
+// Code generated by mkduff.go; DO NOT EDIT.
 // Run go generate from src/runtime to update.
 // See mkduff.go for comments.
 

src/runtime/duff_arm64.s

-// AUTO-GENERATED by mkduff.go
+// Code generated by mkduff.go; DO NOT EDIT.
 // Run go generate from src/runtime to update.
 // See mkduff.go for comments.
 

src/runtime/duff_mips64x.s

-// AUTO-GENERATED by mkduff.go
+// Code generated by mkduff.go; DO NOT EDIT.
 // Run go generate from src/runtime to update.
 // See mkduff.go for comments.
 

src/runtime/duff_ppc64x.s

-// AUTO-GENERATED by mkduff.go
+// Code generated by mkduff.go; DO NOT EDIT.
 // Run go generate from src/runtime to update.
 // See mkduff.go for comments.
 

src/runtime/mkduff.go

@@ -43,7 +43,7 @@ func main() {
 func gen(arch string, tags, zero, copy func(io.Writer)) {
 	var buf bytes.Buffer
 
-	fmt.Fprintln(&buf, "// AUTO-GENERATED by mkduff.go")
+	fmt.Fprintln(&buf, "// Code generated by mkduff.go; DO NOT EDIT.")
 	fmt.Fprintln(&buf, "// Run go generate from src/runtime to update.")
 	fmt.Fprintln(&buf, "// See mkduff.go for comments.")
 	tags(&buf)

src/runtime/mknacl.sh

@@ -6,7 +6,7 @@
 cat /Users/rsc/pub/native_client/src/trusted/service_runtime/include/bits/nacl_syscalls.h |
 	awk '
 	BEGIN {
-		printf("// generated by mknacl.sh - do not edit\n")
+		printf("// Code generated by mknacl.sh; DO NOT EDIT.\n")
 	}
 	NF==3 && $1=="#define" && $2~/^NACL_sys_/ {
 		name=$2

src/runtime/mksizeclasses.go

@@ -48,7 +48,7 @@ func main() {
 	flag.Parse()
 
 	var b bytes.Buffer
-	fmt.Fprintln(&b, "// AUTO-GENERATED by mksizeclasses.go; DO NOT EDIT")
+	fmt.Fprintln(&b, "// Code generated by mksizeclasses.go; DO NOT EDIT.")
 	fmt.Fprintln(&b, "//go:generate go run mksizeclasses.go")
 	fmt.Fprintln(&b)
 	fmt.Fprintln(&b, "package runtime")

src/runtime/sizeclasses.go

-// AUTO-GENERATED by mksizeclasses.go; DO NOT EDIT
+// Code generated by mksizeclasses.go; DO NOT EDIT.
 //go:generate go run mksizeclasses.go
 
 package runtime

src/runtime/syscall_nacl.h

-// generated by mknacl.sh - do not edit
+// Code generated by mknacl.sh; DO NOT EDIT.
 #define SYS_null 1
 #define SYS_nameservice 2
 #define SYS_dup 8

src/unicode/maketables.go

@@ -443,9 +443,9 @@ const progHeader = `// Copyright 2013 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Generated by running
+// Code generated by maketables; DO NOT EDIT.
+// To regenerate, run:
 //	maketables --tables=%s --data=%s --casefolding=%s
-// DO NOT EDIT
 
 package unicode
 

src/unicode/tables.go

@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Generated by running
+// Code generated by maketables; DO NOT EDIT.
+// To regenerate, run:
 //	maketables --tables=all --data=http://www.unicode.org/Public/9.0.0/ucd/UnicodeData.txt --casefolding=http://www.unicode.org/Public/9.0.0/ucd/CaseFolding.txt
-// DO NOT EDIT
 
 package unicode