Add link to new Jupyter docs and small updates

docs/what_is_jupyter.rst

@@ -3,14 +3,14 @@
 What is Jupyter Notebook
 ========================
 
-**Jupyter Notebook App** (formerly **IPython Notebook**) is an application which runs inside your
-browser.
-For the purpose of this guide, *Jupyter Notebook App* is run locally like a normal desktop
-application and does not require accessing any remote server.
+**Jupyter Notebook App** (formerly **IPython Notebook**) is 
+an application which runs inside your browser.
+This guide describes how to install and use *Jupyter Notebook App* 
+as normal desktop application, without using any remote server.
 
 "notebooks" (all lower case) are text documents
-produced by the *Jupyter Notebook App* which contain both python code and rich text format elements 
-(paragraph, equations, figures, links, etc...).
+produced by the *Jupyter Notebook App* which contain both computer code (e.g. python) 
+and rich text format elements (paragraph, equations, figures, links, etc...).
 Notebook documents are both human-readable documents containing the analysis
 description and the results (figures, tables, etc..) as well as executable documents
 which can be run to perform data analysis.
@@ -22,8 +22,9 @@ Official Jupyter Project Pages:
 
 - `Project Jupyter <https://jupyter.org/>`__
 - `IPython Notebook Homepage <http://ipython.org/notebook.html>`__
+- `Jupyter Documentation <http://jupyter.readthedocs.org/>`__
 
-Some more in-depth (but slightly outdated) introduction:
+A more in-depth (but slightly outdated) introduction on using the *Jupyter Notebook App*:
 
 - `What is the IPython Notebook? <http://nbviewer.ipython.org/github/jupyter/strata-sv-2015-tutorial/blob/master/00%20-%20Introduction.ipynb>`__
 
@@ -36,9 +37,9 @@ Quick Glossary
 ~~~~~~~~~~~~~~~~~~~~~~
 
 The *Jupyter Notebook App* is a server application that allows 
-operating on notebook documents (open, close, run, etc...).
-In this guide, the *Jupyter Notebook App* is run on a local desktop 
-and does not require any internet access.
+operating on notebook documents (open, close, run, etc...) via a web browser.
+The *Jupyter Notebook App* can be run on a local desktop 
+and without requiring internet access.
 In addition to displaying/editing/running notebook documents, 
 the *Jupyter Notebook App* has a "Dashboard" (:ref:`dashboard`),
 a "control panel" showing local files and allowing to
@@ -54,8 +55,8 @@ A notebook *kernel* is a "computational engine"
 that executes the code contained in a notebook document.
 In this guide, we always refer to a specific kernel called *ipython kernel* 
 which executes python code. 
-Kernels for many other languages exists; the *ipython kernel* is the one
-for the python language.
+Kernels for many other languages exists 
+(`official kernels <http://jupyter.readthedocs.org/en/latest/#kernels>`__).
 
 When opening a notebook document, the associated *kernel* is automatically launched.
 When the notebook is *executed* (either cell-by-cell or with menu *Cell -> Run All*),
@@ -73,7 +74,8 @@ highlights notebooks with running kernels and allows to shut them down.
 *Notebook Dashboard*
 ~~~~~~~~~~~~~~~~~~~~
 
-The *Notebook Dashboard* is the component of the *Jupyter Notebook App* which is shown first when the :ref:`notebook_app` is launched.
+The *Notebook Dashboard* is the component of the *Jupyter Notebook App* which 
+is shown first when the :ref:`notebook_app` is launched.
 
 The *Notebook Dashboard* is mainly used to open notebook documents, and to manage
 the running :ref:`kernels <kernel>` (visualize and shutdown).