Apply suggestions: improve message text

Co-Authored-By: Jordan Harband <[email protected]>

Author: golopot

lib/rules/jsx-no-useless-fragment.js

@@ -18,8 +18,8 @@ module.exports = {
       url: docsUrl('jsx-no-useless-fragment')
     },
     messages: {
-      NeedsMoreChidren: 'Fragments should contain more than one child.',
-      ChildOfHtmlElement: 'Fragment in a html element is useless.'
+      NeedsMoreChidren: 'Fragments should contain more than one child - otherwise, there‘s no need for a Fragment at all.',
+      ChildOfHtmlElement: 'Passing a fragment to an HTML element is useless.'
     }
   },