Remove sprintf example with $^V which does not exist in P6

Author: samcv

doc/Type/Str.pod6

@@ -554,7 +554,6 @@ displaying ordinal values of characters in arbitrary strings:
 
 =begin code :skip-test
   NYI sprintf "%vd", "AB\x{100}";           # "65.66.256"
-  NYI sprintf "version is v%vd\n", $^V;     # Perl 6's version
 =end code
 
 You can also explicitly specify the argument number to use for the