Edoc fixes for readable HTML generation

* Fix vertical whitespace and code formatting in module doc string (particularly noticeable in the wm modules)
* Some textual improvements to same
* Various fixes to `@see/@link`:
  * Separate `@see` from `@doc`
  * Replace `@see` with `@link` where appropriate
  * Fix cross-references to other Riak applications
  * Drop `@see` where it isn't actually part of edoc

* UTF-8 encoding for files where Nuno Preguiça is referenced in edoc strings so rendered properly
* Fix URLs in edoc strings (require [] for URL-ification)
* Various grammar fixes
* Replace "" and '' with `' where appropriate
Is it possible to manually insert the heading instead of using the shortcut? e.g.

```html
<h2>About using <code>{modfun, Mod, Fun, Arg}</code> generator to a MapReduce job</h2>
```