Little changes to explaination of $*PERL.

I don't believe we need anymore to keep track of the 6.b version.
Adjusted the example to v6.c, stating that $*PERL is an object.

Author: fluca1978

doc/Language/5to6-perlvar.pod6

@@ -167,8 +167,11 @@ C<OLDPWD> is missing from Perl 6's %ENV.
 
 =item $]
 
-The version of perl is returned by C<$*PERL.version>. For the beta this was
-"v6.b" with C<$*PERL> containing "Perl 6 (6.b)".
+The running version of Perl 6 is kept by C<$*PERL> special variable, that is an object.
+The running version is retrieved via C<$*PERL.version>, which returns something
+like C<v6.c>; the full stringified version of the Perl interpreter is obtained
+via C<$*PERL.Str>, which returns something like C<Perl 6 (6.c)>.
+
 
 =item $SYSTEM_FD_MAX