cmd/go: add /v2 to another require example

This is the same change as in CL 144917, but applied to a nearby line.

For #28374.

Change-Id: I6e1693d3a14e2517d863d1052a06c1156fc1edd4
Reviewed-on: https://go-review.googlesource.com/c/go/+/263437
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
index 583ae9e..6e0d833 100644
--- a/src/cmd/go/alldocs.go
+++ b/src/cmd/go/alldocs.go
@@ -1976,7 +1976,7 @@
 // like in Go imports:
 //
 // 	require (
-// 		new/thing v2.3.4
+// 		new/thing/v2 v2.3.4
 // 		old/thing v1.2.3
 // 	)
 //
diff --git a/src/cmd/go/internal/modload/help.go b/src/cmd/go/internal/modload/help.go
index 56920c2..0d2dd28 100644
--- a/src/cmd/go/internal/modload/help.go
+++ b/src/cmd/go/internal/modload/help.go
@@ -439,7 +439,7 @@
 like in Go imports:
 
 	require (
-		new/thing v2.3.4
+		new/thing/v2 v2.3.4
 		old/thing v1.2.3
 	)