Merge pull request #550 from eteq/doc-intro-addition

Update doc intro

docs/index.rst

@@ -15,9 +15,9 @@ Specutils Documentation
 .. image:: img/logo.png
 
 
-The ``specutils`` package provides a basic interface for the loading,
-manipulation, and common forms of analysis of spectroscopic data. These
-generic data containers and accompanying modules will provide a toolbox that the
+``specutils`` is a Python package for representing, loading,
+manipulating, and analyzing astronomical spectroscopic data. The
+generic data containers and accompanying modules provide a toolbox that the
 astronomical community can use to build more domain-specific packages. For more
 details about the underlying principles, see
 `APE13 <https://github.com/astropy/astropy-APEs/blob/master/APE13.rst>`_, the