Update intro for library overview topic

Based on suggestions from James and Shati

Author: felicitymay

docs/language/learn-ql/python/introduce-libraries-python.rst

@@ -1,12 +1,14 @@
 CodeQL library for Python
 =========================
 
-Overview of the extensive library you use to analyze databases generated from Python code bases. This library uses classes with abstractions and predicates to present the data in an object-oriented form. This abstraction makes it easier for you to write queries.
+This is an overview of the extensive library you use to analyze databases generated from Python code bases. Using this library makes it easier for you to write queries.
 
 About the CodeQL library for Python
 -----------------------------------
 
-The CodeQL library for each programming language is implemented as a set of QL modules, that is, files with the extension ``.qll``. The module ``python.qll`` imports all the core Python library modules, so you can include the complete library by beginning your query with:
+The CodeQL library for each programming language uses classes with abstractions and predicates to present data in an object-oriented form. This abstraction makes it easier for you to write queries.
+
+Each CodeQL library is implemented as a set of QL modules, that is, files with the extension ``.qll``. The module ``python.qll`` imports all the core Python library modules, so you can include the complete library by beginning your query with:
 
 .. code-block:: ql