Grammar fix and style tweak in docs/sources/faq.md

Just a few things I thought could be improved in the FAQ.

Signed-off-by: Nate Eagleson <nate@nateeag.com>

docs/sources/faq.md

@@ -8,7 +8,7 @@ page_keywords: faq, questions, documentation, docker
 
 ### How much does Docker cost?
 
-Docker is 100% free, it is open source, so you can use it without
+Docker is 100% free. It is open source, so you can use it without
 paying.
 
 ### What open source license are you using?
@@ -19,12 +19,12 @@ https://github.com/docker/docker/blob/master/LICENSE)
 
 ### Does Docker run on Mac OS X or Windows?
 
-Not at this time, Docker currently only runs on Linux, but you can use
-VirtualBox to run Docker in a virtual machine on your box, and get the
-best of both worlds. Check out the [*Mac OS X*](../installation/mac/#macosx)
-and [*Microsoft Windows*](../installation/windows/#windows) installation
-guides. The small Linux distribution boot2docker can be run inside virtual
-machines on these two operating systems.
+Docker currently runs only on Linux, but you can use VirtualBox to run
+Docker in a virtual machine on your box, and get the best of both worlds.
+Check out the [*Mac OS X*](../installation/mac/#macosx) and [*Microsoft
+Windows*](../installation/windows/#windows) installation guides. The small
+Linux distribution boot2docker can be run inside virtual machines on these
+two operating systems.
 
 ### How do containers compare to virtual machines?