added example of Bar chart

packages/mermaid/src/docs/syntax/gantt.md

@@ -356,3 +356,24 @@ Beginner's tip—a full example using interactive links in an html context:
   </script>
 </body>
 ```
+
+## Examples
+
+### Bar chart (using gantt chart)
+
+```mermaid-example
+gantt
+    title Git Issues - days since last update
+    dateFormat  X
+    axisFormat %s
+    section Issue19062
+    71   : 0, 71
+    section Issue19401
+    36   : 0, 36
+    section Issue193
+    34   : 0, 34
+    section Issue7441
+    9    : 0, 9
+    section Issue1300
+    5    : 0, 5
+```