ref: Rename test.InitForTest to test.V23Init

The test.Init function remains unchanged.

Change-Id: Ic3838daea7a5d57bf4efe34b6a6d5e446c835ae0
MultiPart: 2/3
diff --git a/test/doc.go b/test/doc.go
index cb84f2b..206164e 100644
--- a/test/doc.go
+++ b/test/doc.go
@@ -14,11 +14,10 @@
 //     os.Exit(m.Run())
 // }
 //
-// InitForTest can be used within test functions as a safe alternative
-// to v23.Init.
+// V23Init can be used within test functions as a safe alternative to v23.Init.
 //
 // func TestFoo(t *testing.T) {
-//    ctx, shutdown := test.InitForTest()
+//    ctx, shutdown := test.V23Init()
 //    defer shutdown()
 //    ...
 // }