internal/poll: fix a few function names on comments

Change-Id: I5b1dfeeb0ae5ac32667633151ef83bcf4654c43f
Reviewed-on: https://go-review.googlesource.com/c/go/+/357957
Reviewed-by: Tobias Klauser <[email protected]>
Reviewed-by: Emmanuel Odeke <[email protected]>
Trust: Tobias Klauser <[email protected]>
Run-TryBot: Tobias Klauser <[email protected]>
TryBot-Result: Go Bot <[email protected]>

Author: panjf2000

src/internal/poll/fd_unix.go

@@ -230,7 +230,7 @@ func (fd *FD) ReadFrom(p []byte) (int, syscall.Sockaddr, error) {
 	}
 }
 
-// ReadFrom wraps the recvfrom network call for IPv4.
+// ReadFromInet4 wraps the recvfrom network call for IPv4.
 func (fd *FD) ReadFromInet4(p []byte, from *syscall.SockaddrInet4) (int, error) {
 	if err := fd.readLock(); err != nil {
 		return 0, err
@@ -257,7 +257,7 @@ func (fd *FD) ReadFromInet4(p []byte, from *syscall.SockaddrInet4) (int, error)
 	}
 }
 
-// ReadFrom wraps the recvfrom network call for IPv6.
+// ReadFromInet6 wraps the recvfrom network call for IPv6.
 func (fd *FD) ReadFromInet6(p []byte, from *syscall.SockaddrInet6) (int, error) {
 	if err := fd.readLock(); err != nil {
 		return 0, err