Update installation.rst

source/installation.rst

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 Installation
 ************
 
- Welcome to the Installation section.  Here you will find Getting started Guides on how to install FusionPBX different operating systems.  The default method is on Debian 8 (Jessie) with the recomended isntall script 
+Welcome to the Installation section.  Here you will find Getting started Guides on how to install FusionPBX different operating systems.  The default method is on Debian 8 (Jessie) with the recomended isntall script 
 
 .. toctree::
   :maxdepth: 3