Fix minor typo

Signed-off-by: sapphiredev <se.imas.kr@gmail.com>

docs/sources/faq.md

@@ -148,7 +148,7 @@ Linux:
  - Ubuntu 12.04, 13.04 et al 
  - Fedora 19/20+ 
  - RHEL 6.5+ 
- - Centos 6+ 
+ - CentOS 6+ 
  - Gentoo 
  - ArchLinux 
  - openSUSE 12.3+ 

docs/sources/installation/centos.md

@@ -46,7 +46,7 @@ start or restart `firewalld` after Docker, you will have to restart the Docker d
 
 ## Installing Docker - CentOS-6.5
 
-For Centos-6.5, the Docker package is part of [Extra Packages
+For CentOS-6.5, the Docker package is part of [Extra Packages
 for Enterprise Linux (EPEL)](https://fedoraproject.org/wiki/EPEL) repository,
 a community effort to create and maintain additional packages for the RHEL distribution.