clarify tag separator comments in the example

Author: tbrowder

doc/Language/modules.pod6

@@ -193,11 +193,11 @@ no matter whether the using program adds any tag or not.
     =end code
 
 5. Multiple tags may be used in the C<export> trait, but they must
-   be separated by either commas, or whitespace, but not both.
+   all be separated by either commas, or whitespace, but not both.
    
    =begin code
-   sub foo() is export(:foo :s2) {}
-   sub bar() is export(:bar, :s3) {}
+   sub foo() is export(:foo :s2 :net) {}
+   sub bar() is export(:bar, :s3, :some) {}
    =end code
 
 =head3 UNIT::EXPORT::*