[Couchdb Wiki] Trivial Update of "Installing_with_nix" by goibhniu

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The "Installing_with_nix" page has been changed by goibhniu.
The comment on this change is: Changing the style to match other installation guides.
http://wiki.apache.org/couchdb/Installing_with_nix?action=diff&rev1=1&rev2=2

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  The Nix package manager can be used on most operating systems. It allows you to easily install and manage applications separately from your operating system software. 
  http://nixos.org/nix/docs.html describes how to install and use nix. Once installed you can install couchdb with the following command:
- || nix-env -i couchdb ||
  
+ {{{ 
+ nix-env -i couchdb 
+ }}}
+