Update cookbook/01strings/01-00introduction.pl

The code:
<code>my $string = "1" ~ "1" + 10;</code>
will actually output "111" in Perl6.

Since in Perl5, "~" (actually ".") is the same precedence as "+",
but in Perl6, numeric operations have higher precedence.
So the "1" + 1 part will be evaluated first, giving "111" as the result.

Just a small modification here. :)
Update cookbook/01strings/01-00introduction.pl
Merge pull request #12 from ghost/patch-1

Update cookbook/01strings/01-00introduction.pl
[99-probs] Fix P08-viklund.pl

Now, that 'our multi' fix is no longer needed, and in fact breaks the
script.
Modernize Fletcher.pl

Just adding P6-isms here and there.
Fix typos