all: fix typo in doc

Change-Id: I89fdda2914030dfea3183a8b4681dd4b33489729
Reviewed-on: https://go-review.googlesource.com/4996Reviewed-by: Minux Ma <minux@golang.org>

src/net/ip.go

@@ -132,7 +132,7 @@ func (ip IP) IsMulticast() bool {
 	return ip[0] == 0xff
 }
 
-// IsInterfaceLinkLocalMulticast returns true if ip is
+// IsInterfaceLocalMulticast returns true if ip is
 // an interface-local multicast address.
 func (ip IP) IsInterfaceLocalMulticast() bool {
 	return len(ip) == IPv6len && ip[0] == 0xff && ip[1]&0x0f == 0x01

src/os/env.go

@@ -33,7 +33,7 @@ func ExpandEnv(s string) string {
 	return Expand(s, Getenv)
 }
 
-// isSpellSpecialVar reports whether the character identifies a special
+// isShellSpecialVar reports whether the character identifies a special
 // shell variable such as $*.
 func isShellSpecialVar(c uint8) bool {
 	switch c {

src/runtime/race1.go

@@ -314,7 +314,7 @@ func RaceReleaseMerge(addr unsafe.Pointer) {
 
 //go:nosplit
 
-// RaceEnable re-enables handling of race events in the current goroutine.
+// RaceDisable disables handling of race events in the current goroutine.
 func RaceDisable() {
 	_g_ := getg()
 	if _g_.raceignore == 0 {
@@ -325,7 +325,7 @@ func RaceDisable() {
 
 //go:nosplit
 
-// RaceDisable disables handling of race events in the current goroutine.
+// RaceEnable re-enables handling of race events in the current goroutine.
 func RaceEnable() {
 	_g_ := getg()
 	_g_.raceignore--