Update readme.md

Author: gabyx

src/jupyter_contrib_nbextensions/nbextensions/export_embedded/readme.md

@@ -1,4 +1,4 @@
 Export Embedded HTML
 ====================
-This extension allows exporting an embedded HTML by simple click, (like: jupyter nbconvert --to html_embed notebook.ipynb)
+This extension allows exporting an embedded HTML by simple click or over the menu File -> Download -> HTML Embedded, (like: jupyter nbconvert --to html_embed notebook.ipynb)