fix some compilation issues

doc/Language/5to6-nutshell.pod6

@@ -42,7 +42,7 @@ an embedded instance of the C<perl> interpreter to run Perl 5 code.
 
 This is as simple as:
 
-=for code :preamble<no strict;>
+=for code :skip-test<Inline module not always present when testing>
 use Inline::Perl5;
 use DBI:from<Perl5>;   # the :from<Perl5> makes Perl 6 load via Inline::Perl5
 my $dbh = DBI.connect(...);
@@ -925,6 +925,7 @@ when you don't want another scope:
         next if $_ % 2 == 1;
         $str ~= $_;
         NEXT $str ~= ':';
+    }
 
 
 =head1 Functions
@@ -1164,7 +1165,7 @@ some you need to specify / load your modules in a particular order, you can
 create a stub that will be acceptable until the end of compilation: if the
 stub has not been defined then, compilation will fail.
 
-=for code :preamble<class Animal {}>
+=for code
 # Perl 6
 class Animal { ... }       # the ... indicates a stub
 class Cat is Animal {}