Fix missing spaces in example book

Author: azerupi

book-example/src/README.md

@@ -1,12 +1,10 @@
 # mdBook
 
-**mdBook** is a command line tool and Rust library to create books using Markdown.
-It's very similar to Gitbook but written in [Rust](http://www.rust-lang.org).
+**mdBook** is a command line tool and Rust library to create books using Markdown. It's very similar to Gitbook but written in [Rust](http://www.rust-lang.org).
 
 This book serves as an example of the output of mdBook and as the docs at the same time.
 
-mdBook is free and open source, you can find the source code on [Github](https://github.com/azerupi/mdBook).
-Issues and feature requests can be posted on the [Github Issue tracker](https://github.com/azerupi/mdBook/issues).
+mdBook is free and open source, you can find the source code on [Github](https://github.com/azerupi/mdBook). Issues and feature requests can be posted on the [Github Issue tracker](https://github.com/azerupi/mdBook/issues).
 
 ## API docs