Fixes minor errors in documentation

README.md

 
 ### Manage documents and files ###
 
-Traceability and versioning are very important for high-quality processes. Unfortunately, specialized software are hard to setup and to use.
+Traceability and versioning are very important for high-quality processes. Unfortunately, specialized software are hard to setup and use.
 
 Let's try Tracim ! You define access-control for each workspace and store documents and file there. Users can't delete information: everything is versioned and never deleted.
 

doc/setting.md

 
 ## Other parameters  ##
 
-There are other parameters which may be of some interest for you. For example, you can:
+There are other parameters which may be of interest to you. For example, you can:
 
 * include a JS tracker like Piwik or Google Analytics,
 * define your own notification email subject