Update support portal on Tor Browser for Android

Some information needs to be updated on the support portal:

​https://support.torproject.org/#tormobile

About Tor Browser for Android:

Can I run Tor on an Android device? Who is the Guardian Project? Can I run Tor on an iOS device? How do I run Tor on Windows Phone? When is Tor Browser for Android being released?

migrated from: https://trac.torproject.org/projects/tor/ticket/28475