Ahodges/dosumentation/doc719

@mhoeber , @srpearce , I fixed the policy key names. It should be straightforward to rebase the Publish branch to these changes if we do it soon. 
Having "Release Day" capped and in bold implies that it's a UI element (like a **Release Day** field) somewhere on the page. Since we're just referring to the release day for a section or subsection, we can leave it Roman and lowercase.

If we really want to cap and bold it, we could say something like "the number of days before the **Release Day** value for each section and subsection."