Fix formatting of inline code samples which are pluralized

The docs contain some inline code samples whose formatting is broken, for example on the [Build Definition page](http://www.scala-sbt.org/release/docs/Getting-Started/Basic-Def.html):

![screen shot 2014-02-06 at 01 11 25](https://f.cloud.github.com/assets/754712/2094402/b3658f86-8ecb-11e3-9417-99ea8bc43c0d.png)

I'm pretty sure this is because [Sphinx requires inline markup to be surrounded by spaces](http://sphinx-doc.org/rest.html?highlight=backquote#inline-markup), which can be worked around by adding an escaped space. In the example above, the plural terms like "`class`es" don't have this escaped space.

I used ``\ `[^`]+`[A-Za-z]`` to find any other occurrences and fixed those as well.