update docs

README.md

@@ -16,13 +16,15 @@ A greenlock manager is just a set of a few callbacks to keeps track of:
     -   `renewAt` (ex: '45d')
     -   `challenges` (plugins for 'http-01', 'dns-01', etc)
 
-The callbacks are:
+The **callbacks** are:
 
 -   `set({ subject, altnames, renewAt })` to save site details
 -   `find({ subject, altnames, renewBefore })` which returns a list of matching sites (perhaps all sites)
 -   `remove({ subject })` which marks a site as deleted
 -   `defaults()` which either **gets** or **sets** the global configs that apply to all sites
 
+When do they get called? Well, whenever they need to.
+
 # Some Terminology
 
 -   `subject` refers to the **primary domain** on an SSL certificate
@@ -45,6 +47,7 @@ You can start _really_ simple: just make a file that exports a `create()` functi
 'use strict';
 
 var MyManager = module.exports;
+
 MyManager.create = function(options) {
     console.log('The tests will make me stronger');
     return {};