Fix English

Author: masutaka

README.md

@@ -4,7 +4,7 @@ Forked from imeyer's ruby-1.9.2-rpm project at https://github.com/imeyer/ruby-1.
 
 This spec is an attempt to push for a stable replacement of Ruby 1.8.x with 1.9.2+ on RHEL based systems. The original author based it off of the work of [FrameOS](http://www.frameos.org) specs for Ruby 1.9.2 and Ruby Enterprise Edition.
 
-# A example to build SRPM and RPM
+# Example to build SRPM and RPM
 
 You need to install [VirtualBox](https://www.virtualbox.org/) and [Vagrant](http://www.vagrantup.com/).