TBR ref: s/VANADIUM_ROOT/V23_ROOT/

MultiPart: 3/10
Change-Id: Ifd0795e281d9dd8bc7cb72b7a74d0d102a9c8c0d
diff --git a/cmd/vrpc/vrpc.go b/cmd/vrpc/vrpc.go
index 3a1e2af..a00f86e 100644
--- a/cmd/vrpc/vrpc.go
+++ b/cmd/vrpc/vrpc.go
@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // The following enables go generate to generate the doc.go file.
-//go:generate go run $VANADIUM_ROOT/release/go/src/v.io/x/lib/cmdline/testdata/gendoc.go .
+//go:generate go run $V23_ROOT/release/go/src/v.io/x/lib/cmdline/testdata/gendoc.go .
 
 package main