Small reordering of information in "alias, require, and import"

[siiky]

Hi,

In the "alias, require, and import" chapter of the Getting Started guide, the order in which macros are referenced is not so natural, as in, why are macros mentioned at all in the sentence "means that ..." ? I think it would be better if the last sentence stating that importing also requires was close to the top, before the other one.

Note that import is lexically scoped too. This means that we can import specific macros or functions inside function definitions:
(...)
importing a module automatically requires it.

elixir-lang.github.com/getting-started/alias-require-and-import.markdown

Lines 106 to 117 in 86b983f

	Note that `import` is **lexically scoped** too. This means that we can import specific macros or functions inside function definitions:
	```elixir
	defmodule Math do
	def some_function do
	import List, only: [duplicate: 2]
	duplicate(:ok, 10)
	end
	end
	```
	In the example above, the imported `List.duplicate/2` is only visible within that specific function. `duplicate/2` won't be available in any other function in that module (or any other module for that matter). `import`ing a module automatically `require`s it.

[josevalim]

Can you please send a PR? It will be easier to understand and review the changes. :) Thank you!

[siiky]

Thanks for the very quick reply! I don't have all the deps needed to build for now, but if you think the change is worth I'll install later, build, etc, and update the PR.