Fixing CS and typos on the introduction chapter

Resources/doc/reference/introduction.rst

@@ -1,14 +1,17 @@
 Introduction
 ============
 
-Integrate the FOS/UserBundle in the Sonata Admin Project
+Integrates the FOS/UserBundle in the Sonata Admin Project
 
  - AdminBundle: add user and group management
  - EasyExtends: allows to generate Application level model
 
 The roles to be assigned to users is split in 2 parts:
 
- - editable: the roles the current user is allowed to assign to other users (permission or role ``MASTER``)
- - readonly: the roles assigned to the current user, however the current user is only allowed to see them
+ - **editable :** the roles the current user is allowed to assign to other users 
+    (permission or role ``MASTER``)
+ - **readonly :** the roles assigned to the current user, however the current 
+    user is only allowed to see them
 
-When using ACL, the UserBundle prevents ``normal`` user to change settings of ``super-admin`` users.
+When using ACL, the UserBundle prevents ``normal`` user to change settings of 
+``super-admin`` users.