Rewrite docs clarity (#1534)

* Add a few words and bits for clarity and better text flow in the rewrite docs
* Rephrase some helpful wording

docs/simple-application.md

@@ -185,7 +185,7 @@ module.exports = {
 
 Notice that we added an `oninit` method to the component, which references `User.loadList`. This means that when the component initializes, User.loadList will be called, triggering an XHR request. When the server returns a response, `User.list` gets populated.
 
-Also notice we **didn't** do `oninit: User.loadList()` (with parentheses at the end). The difference is that `oninit: User.loadList()` calls the function once and immediately, but `oninit: User.loadList` only calls that function when the component renders. This is an important difference and a common newbie mistake: calling the function immediately means that the XHR request will fire even if the component never renders. Also, if the component is ever recreated (through navigating back and forth through the application), the function won't be called again as expected.
+Also notice we **didn't** do `oninit: User.loadList()` (with parentheses at the end). The difference is that `oninit: User.loadList()` calls the function once and immediately, but `oninit: User.loadList` only calls that function when the component renders. This is an important difference and a common pitfall for developers new to javascript: calling the function immediately means that the XHR request will fire as soon as the source code is evaluated, even if the component never renders. Also, if the component is ever recreated (through navigating back and forth through the application), the function won't be called again as expected.
 
 ---
 
@@ -199,7 +199,7 @@ var UserList = require("./view/UserList")
 m.mount(document.body, UserList)
 ```
 
-The `m.mount` call renders the specified component (`UserList`) into a DOM element (`document.body`), erasing any DOM that were there previously. Opening the HTML file in a browser should now display a list of person names.
+The `m.mount` call renders the specified component (`UserList`) into a DOM element (`document.body`), erasing any DOM that was there previously. Opening the HTML file in a browser should now display a list of person names.
 
 ---
 
@@ -207,9 +207,9 @@ Right now, the list looks rather plain because we have not defined any styles.
 
 There are many similar conventions and libraries that help organize application styles nowadays. Some, like [Bootstrap](http://getbootstrap.com/) dictate a specific set of HTML structures and semantically meaningful class names, which has the upside of providing low cognitive dissonance, but the downside of making customization more difficult. Others, like [Tachyons](http://tachyons.io/) provide a large number of self-describing, atomic class names at the cost of making the class names themselves non-semantic. "CSS-in-JS" is another type of CSS system that is growing in popularity, which basically consists of scoping CSS via transpilation tooling. CSS-in-JS libraries achieve maintainability by reducing the size of the problem space, but come at the cost of having high complexity.
 
-Regardless of what CSS convention/library you choose, a good rule of thumb is to avoid the cascading aspect of CSS. To keep this tutorial simple, we'll just use plain CSS with overly explicit class names, so that the styles themselves provide the atomicity of Tachyons, and class name collisions are made unlikely through the verbosity of the class names. Plain CSS can be sufficient for low-complexity projects (e.g. 3 to 6 man-months of initial implementation time and few project phases)
+Regardless of what CSS convention/library you choose, a good rule of thumb is to avoid the cascading aspect of CSS. To keep this tutorial simple, we'll just use plain CSS with overly explicit class names, so that the styles themselves provide the atomicity of Tachyons, and class name collisions are made unlikely through the verbosity of the class names. Plain CSS can be sufficient for low-complexity projects (e.g. 3 to 6 man-months of initial implementation time and few project phases).
 
-To add styles, let's first create a file called `styles.css` and include it in the `index.html` file
+To add styles, let's first create a file called `styles.css` and include it in the `index.html` file:
 
 ```markup
 <!doctype html>