Use numification / stringification shortcuts

doc/Language/5to6-perlvar.pod6

@@ -86,8 +86,8 @@ In Perl 6 the group information is handled by C<$*GROUP>,
 which holds an object of type L<IntStr|/type/IntStr>
 and therefore can be used either within a string
 or a numeric context.
-The group id is therefore obtained via C<$*GROUP.Numeric>, while the
-group name via C<$*GROUP.Str>.
+The group id is therefore obtained via C<+$*GROUP>, while the
+group name via C<~$*GROUP>.
 
 =item $EFFECTIVE_GROUP_ID
 
@@ -108,9 +108,8 @@ which holds an object of type L<IntStr|/type/IntStr>
 and therefore can be used either within a string
 or a numeric context (this is similar to how the group
 information is handled by the C<$*GROUP> object).
-The user id is therefore obtained via C<$*USER.Numeric>, while the
-username via C<$*USER.Str>.
-
+The user id is therefore obtained via C<+$*USER>, while the
+username via C<~$*USE>.
 
 =item $EFFECTIVE_USER_ID