Add simple example of correct closing slash

Author: Diogo Franco

lib/rules/jsx-tag-spacing.js

@@ -28,10 +28,10 @@ function getTokenBeforeClosingBracket(node) {
 function validateClosingSlash(context, node, option) {
   var sourceCode = context.getSourceCode();
 
-  var SELF_CLOSING_NEVER_MESSAGE = 'Whitespace is forbidden between `/` and `>`';
-  var SELF_CLOSING_ALWAYS_MESSAGE = 'Whitespace is required between `/` and `>`';
-  var NEVER_MESSAGE = 'Whitespace is forbidden between `<` and `/`';
-  var ALWAYS_MESSAGE = 'Whitespace is required between `<` and `/`';
+  var SELF_CLOSING_NEVER_MESSAGE = 'Whitespace is forbidden between `/` and `>`; write `/>`';
+  var SELF_CLOSING_ALWAYS_MESSAGE = 'Whitespace is required between `/` and `>`; write `/ >`';
+  var NEVER_MESSAGE = 'Whitespace is forbidden between `<` and `/`; write `</`';
+  var ALWAYS_MESSAGE = 'Whitespace is required between `<` and `/`; write `< /`';
 
   var adjacent;