Fix typos and image size

Author: willingc

README.md

@@ -7,15 +7,15 @@
 The Jupyter notebook is a web-based notebook environment for interactive
 computing.
 
-![Jupyter notebook example](docs/resources/running_code.png "Jupyter notebook example")
+![Jupyter notebook example](docs/resources/running_code_med.png "Jupyter notebook example")
 
-## Jupyter notebook -- the language-agnostic evolution of IPython notebook
+## Jupyter notebook, the language-agnostic evolution of IPython notebook
 Jupyter notebook is the language-agnostic HTML notebook application for
 Project Jupyter. In 2015, Jupyter notebook was released as part of
 The Big Split of the IPython codebase. IPython 3 was the last major monolithic
 release containing both language-agnostic code, such as the *IPython notebook*,
 and language specific code, such as the *IPython kernel for Python*. As
-computing spans many languages, Project Jupyter will continue to develop th
+computing spans many languages, Project Jupyter will continue to develop the
 language-agnostic **Jupyter notebook** in this repo and with the help of the
 community develop language specific kernels which are found in their own
 discrete repos.