docs: Improve embed files code fragment

docs/embed-files.md

@@ -65,9 +65,11 @@ Sometimes you don't want to embed a whole file. Maybe because you need just a fe
 ```
 
 In your code file you need to surround the fragment between `/// [demo]` lines (before and after the fragment).
-Alternatively you can use `### [demo]`. By default, only identifiers are omitted. To omit the entire line containing the identifier in the fragment output, you can add the `:omitFragmentLine` option.
+Alternatively you can use `### [demo]`. By default, only identifiers are omitted. To omit the entire line containing the identifier in the fragment output, add the `:omitFragmentLine` option. This is useful if your code fragment is e.g. HTML and you want to hide the Docsify fragment identifier from showing in your HTML source. `<!-- /// [demo] -->` in your source file and `:omitFragmentLine` will make the `-->` not show up in your Docsify code fragment section.
 
-Example:
+Example ([\_media/example.js](_media/example.js ':ignore')):
+
+`[filename](_media/example.js ':include :type=code :fragment=demo')`
 
 [filename](_media/example.js ':include :type=code :fragment=demo')