Adding link to PDF documentation into the README.

Author: romainruaud

README.md

@@ -12,15 +12,15 @@ Documentation :
 ===============
 
 * [Installing the module](doc/install.md)
-* [User documentation](doc/user-documentation.md)
+* [User documentation](doc/user-documentation.md) (PDF version : [User documentation](doc/User Guide-Magento Elastic Suite for Magento 1.pdf))
 * [Developper documentation](doc/developper-documentation.md)
 * [Behavorial search documentation](doc/behavorial-search.md)
 * [Indexing custom content](doc/indexing.md)
 
 FAQ
 ===
 
-Why choosing ElaticSearch instead of extending the SolR implementation shipped with Magento EE ?
+Why choosing ElasticSearch instead of extending the SolR implementation shipped with Magento EE ?
 ------------------------------------------------------------------------------------------------
 First, ElasticSearch contains a lot more features usefull we need to achieve some features of the project :