Update modules.pod6

Author: rafaelschipiura

doc/Language/modules.pod6

@@ -565,7 +565,7 @@ lib
     There are more fields described in the L<META design documents |
     https://design.perl6.org/S22.html#META6.json>, but not all of these are
     implemented by existing package managers. Hence you should stick to the
-    fields described in the above example block to ensure compatability with
+    fields described in the above example block to ensure compatibility with
     existing package managers.
 
     =end item