[CentOS-docs] http://wiki.centos.org/HowTos/JavaRuntimeEnvironment

Hi all

     According to a report made in #centos, the procedure described at 
http://www.if-not-true-then-false.com/2010/install-sun-oracle-java-jdk-jre-7-on-fedora-centos-red-hat-rhel/ 
works OK for jdk 1.7
     It looks pretty similar to 
http://wiki.centos.org/HowTos/JavaRuntimeEnvironment so I updated our 
page to reflect the fact the jre-1.7 can be installed using the 
procedure already described in the wiki. Any objections on including jdk 
( and maybe replacing the links to the binary packages with 
http://www.oracle.com/technetwork/java/javase/downloads/index.html. so 
that the user can choose between 1.6/1.7 jre/jdk )?