[Hadoop Wiki] Trivial Update of "UnknownHost" by SteveLoughran

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The "UnknownHost" page has been changed by SteveLoughran:
https://wiki.apache.org/hadoop/UnknownHost?action=diff&rev1=1&rev2=2

Comment:
typo

  
  Some possible causes (not an exclusive list):
   * The site's DNS server does not have an entry for the node. Test: do an {{{nslookup <hostname>}}} from the client machine.
-  * The calling machine's host table {{{//etc/hosts}}} lacks an entry for the host, and DNS isn't helping out
+  * The calling machine's host table {{{/etc/hosts}}} lacks an entry for the host, and DNS isn't helping out
   * There's some error in the configuration files and the hostname is actually wrong.
   * A worker node thinks it has a given name -which it reports to the NameNode and JobTracker, but that isn't the name that the network team expect, so it isn't resolvable.
   * The calling machine is on a different subnet from the target machine, and short names are being used instead of fully qualified domain names (FQDNs).