[Cassandra Wiki] Update of "FAQ" by EricEvans

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The "FAQ" page has been changed by EricEvans.
The comment on this change is: link to anchor, escape wiki names, minor editorial.
http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=18&rev2=19

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   * [[#existing_data_when_adding_new_nodes|What happens to existing data in my cluster when I add new nodes?]]
   * [[#modify_cf_config|Can I add/remove/rename Column Families on a working cluster?]]
   * [[#node_clients_connect_to|Does it matter which node a Thrift client connects to?]]
+  * [[#what_kind_of_hardware_should_i_use|What kind of hardware should I run Cassandra on?]]
  
  <<Anchor(cant_listen_on_ip_any)>>
  == Why can't I make Cassandra listen on 0.0.0.0 (all my addresses)? ==
@@ -51, +52 @@

   1. Use the `get_string_property("token map")` RPC to obtain an update-to-date list of the nodes in the cluster and cycle through them.
   1. Deploy a load-balancer, proxy, etc.
  
+ <<Anchor(what_kind_of_hardware_should_i_use)>>
  == What kind of hardware should I run Cassandra on? ==
  
   * Memory
@@ -58, +60 @@

   * CPU
     * FIXME
   * Disk
-    * For optimal performance, at least 2 disks are required to run Cassandra. One disk should be dedicated to use by the commit log (defined by the CommitLogDirectory config parameter), and the remainder of your drives should be listed as places to store data files (the DataFileDirectories config parameter).
+    * For optimal performance, at least 2 disks are required to run Cassandra. One disk should be dedicated for use by the commit log (defined by the !CommitLogDirectory config parameter), and the remainder should be listed as places to store data files (the !DataFileDirectories config parameter).
-    * If you use raid, it is recommended to use raid1 pairs, and to list each pair separately as DataFileDirectories, with one pair for the CommitLogDirectory
+    * If you use raid, it is recommended to use raid1 pairs, and to list each pair separately as !DataFileDirectories, with one pair for the !CommitLogDirectory