os: fix SyscallConn typos in the File.Fd comments

This CL fixes two typos introduced in CL 256899.

Change-Id: I47f0a3097deeeec8d6e9bbe7073fcf7a28c5dff9
Reviewed-on: https://go-review.googlesource.com/c/go/+/257997


Trust: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>

src/os/file_plan9.go

@@ -35,7 +35,7 @@ type file struct {
 // a finalizer might be run. On Unix systems this will cause the SetDeadline
 // methods to stop working.
 //
-// As an alternative, see the f.SyscallCon method.
+// As an alternative, see the f.SyscallConn method.
 func (f *File) Fd() uintptr {
 	if f == nil {
 		return ^(uintptr(0))

src/os/file_unix.go

@@ -68,7 +68,7 @@ type file struct {
 // a finalizer might be run. On Unix systems this will cause the SetDeadline
 // methods to stop working.
 //
-// As an alternative, see the f.SyscallCon method.
+// As an alternative, see the f.SyscallConn method.
 func (f *File) Fd() uintptr {
 	if f == nil {
 		return ^(uintptr(0))