edit try.html: 'some our tools' -> 'some of our tools' (#771)

Author: zipperer

try.html

@@ -6,7 +6,7 @@
 
 intro: |
     Project Jupyter builds tools, standards, and services for many different use cases. This page
-    has links to interactive demos that allow you to try some our tools for free online, thanks to
+    has links to interactive demos that allow you to try some of our tools for free online, thanks to
     <a href="https://mybinder.org">mybinder.org</a>, a free public service provided by the Jupyter community.
 
 applications_copy: |