[Cassandra Wiki] Trivial Update of "GettingStarted" by JonathanEllis

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The "GettingStarted" page has been changed by JonathanEllis:
https://wiki.apache.org/cassandra/GettingStarted?action=diff&rev1=101&rev2=102

Comment:
update rpm link to a stable "latest" url

  == Step 1: Download Cassandra ==
   * Download links for the latest stable release can always be found on the [[http://cassandra.apache.org/download|website]].
   * Users of Debian or Debian-based derivatives can install the latest stable release in package form, see DebianPackaging for details.
-  * Users of RPM-based distributions can get packages from [[http://www.datastax.com/documentation/cassandra/1.2/webhelp/index.html#cassandra/install/installRHEL_t.html|Datastax]].
+  * Users of RPM-based distributions can get packages from [[www.datastax.com/documentation/latest-dsc-InsRhel|Datastax]].
   * If you are interested in building Cassandra from source, please refer to [[HowToBuild|How to Build]] page.
  
  For more details about misc builds, please refer to [[VersionsAndBuilds|Cassandra versions and builds]] page.