In Help/FAQ.rst, replaced erroneous descriptions

[ashwinpn]

Checklist

Solves #589

• [x] I read the commit guidelines and I've followed them.
• [x] I ran coala over my code locally. (All commits have to pass individually. It is not sufficient to have "fixup commits" on your PR, our bot will still report the issues for the previous commit.) You will likely receive a lot of bot comments and build failures if coala does not pass on every single commit!