Update language/module.md

Co-authored-by: Ewoud Kohl van Wijngaarden <ewoud@kohlvanwijngaarden.nl>

language/module.md

@@ -8,7 +8,7 @@ a Puppet Module Release.
 A module in the sense of this document is a compressed tar archive. It is
 usually distributed via [forge.puppet.com](https://forge.puppet.com/). A module
 is usually developed in a git repository. Some files in the git repository are
-only used for development and testing. They shall not be released.
+only used for development and testing. They should not be released.
 
 Common files often seen in a vcs repository that are used for development but
 shall not be released: