Fix octal literals

“Leading 0 does not indicate octal in Perl 6. Please use 0o12 if you
mean that”

Author: AlexDaniel

doc/Type/Str.pod6

@@ -540,8 +540,8 @@ is ignored:
 When the C<#> flag and a precision are given in the C<%o> conversion, the
 precision is incremented if it's necessary for the leading "0":
 
-  sprintf '<%#.5o>', 012;      # OUTPUT: «<000012>␤»
-  sprintf '<%#.5o>', 012345;   # OUTPUT: «<012345>␤»
+  sprintf '<%#.5o>', 0o12;     # OUTPUT: «<000012>␤»
+  sprintf '<%#.5o>', 0o12345;  # OUTPUT: «<012345>␤»
   sprintf '<%#.0o>', 0;        # OUTPUT: «<>␤» # zero precision results in no output!
 
 B<vector flag>