Resolve doc_lazy_continuation warnings in documentation

Summary:
This lint caught a legit mistake in the documentation.

```lang=text,counterexample
error: doc list item missing indentation
  --> superconsole/src/lib.rs:20:5
   |
20 | //! Components live in the scratch area.
   |     ^
   |
   = help: if this is supposed to be its own paragraph, add a blank line
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html...
   = note: `-D clippy::doc-lazy-continuation` implied by `-D clippy::all`
   = help: to override `-D clippy::all` add `#[allow(clippy::doc_lazy_continuation)]`
help: indent this line
   |
20 | //!   Components live in the scratch area.
   |     ++
```

Without a blank line between the last bullet and next line, according to Markdown that sentence becomes part of the last bullet. Based on the content, it definitely does not seem like that was intended by the author of this documentation.

 {F1795256035}

Reviewed By: shayne-fletcher, JakobDegen

Differential Revision: D60933067

fbshipit-source-id: 7aba872b716c6351f000d77f44ac0e4b5f292765

src/lib.rs

@@ -15,8 +15,11 @@
 //! User input will cause aberrations in output; similarly, one should also not produce output from other sources while superconsole is active.
 //!
 //! The rendering can be divided into two principle components:
+//!
 //! * In the *scratch* area, the previous content is overwritten at each render.
+//!
 //! * In the *emitted* area, lines scroll away above the scratch with various diagnostic output.
+//!
 //! Components live in the scratch area.
 //!
 //! A set of pre-baked composition and testing oriented components are provided in the [`components`] module.