refine text

Author: mmcky

lectures/intro.md

@@ -15,8 +15,8 @@ This website presents a set of lectures on Python programming for economics and
 [Thomas J. Sargent](http://www.tomsargent.com/) and [John Stachurski](http://johnstachurski.net/). This is the first text in the series, which focuses on programming in Python.
 
 ```{admonition} News
-[QuantEcon](https://quantecon.org) is moving to [Jupyter Book](https://jupyterbook.org/intro.html)
-to build all of its projects. We are a founding member of the
+[QuantEcon](https://quantecon.org) is moving to the [Jupyter Book](https://jupyterbook.org/intro.html)
+build system for all of its projects. We are a founding member of the
 [Executable Books Project](https://github.com/executablebooks) and this
 is the first in the QuantEcon lecture series to migrate. Please send feedback to [contact@quantecon.org](mailto:contact@quantecon.org)
 ```