fix another test comment

testdata/src/typealias/foo/foo.go

@@ -9,7 +9,7 @@ type T1 = bar.T2
 const (
  A = bar.A // matches bar.A by value; can be listed in switch case instead of bar.A
  B = bar.B // matches bar.B by value; can be listed in switch case instead of bar.B
- C bar.T2 = "+" // matches bar.C by value; can be listed instead of foo.C in switch
+ C bar.T2 = "+" // matches bar.C by value; can be listed instead of bar.C in switch
  F T1 = "|" // matches bar.F by value (type does not matter); can be listed in switch case instead of bar.F
  H bar.T2 = "<" // matches bar.I by value (name does not matter); can be listed in switch case instead of bar.I