update sentence syntax

[andreidobrinski]

No description provided.

[bevacqua]

This breaks the link on GitHub (see rendered version). AsciiDoc rendering is funnier than it might seem at first glance. Also the O'Reilly rendered (used by Pony Foo and also their underlying book-formatting efforts) is different from the one used on GitHub (different versions of same software)

[bevacqua]

Example of what I mentioned earlier, based on the changes in #68

GitHub renders footnote references inline:

Whereas O'Reilly Atlas (thus Pony Foo), renders footnote references using anchors:

[andreidobrinski]

Thanks! Hope this works.