Fixed issues reported by @xabbuh

Author: javiereguiluz

book/propel.rst

@@ -4,10 +4,10 @@
 Databases and Propel
 ====================
 
-Propel is an open-source Object-Relational Mapping (ORM) for PHP5 which
+Propel is an open-source Object-Relational Mapping (ORM) for PHP which
 implements the `ActiveRecord pattern`_. It allows you to access your database
 using a set of objects, providing a simple API for storing and retrieving data.
-Propel uses PDO as an abstraction layer, and code generation to remove the
+Propel uses PDO as an abstraction layer and code generation to remove the
 burden of runtime introspection.
 
 A few years ago, Propel was a very popular alternative to Doctrine. However, its