Run-on paragraph in [dcl.spec.auto]/7

[sdutoit]

In the C++14 CD, there is a sequence of three paragraphs, the second and third of which are not numbered, like this:

When a variable declared using a placeholder type is initialized, [...] Let T be the declared type of the variable or return type of the function.
If the placeholder is the auto type-specifier, [...]
If the placeholder is the decltype(auto) type-specifier, [...]

It is tempting to just add paragraph numbers to the second and third paragraphs, but these are really not self-contained. The second and third ones depend on the definitions in the first.

Clean this up editorially.

[jensmaurer]

I can no longer find this issue in the current Working Draft.