[docs] Move React Elements post to right place, fix typo

The URL already made its way around so we can't just break it. We might
want to just live with it instead of even doing this redirect.

https://github.com/plaxdan/react/commit/2b225446c03192b58e176f8885e60055cf5ea436#commitcomment-8176218

Author: zpao

docs/_posts/2014-10-14-introducting-react-elements.md renamed to docs/_posts/2014-10-14-introducing-react-elements.md

@@ -1,6 +1,7 @@
 ---
 title: "Introducing React Elements"
 author: Sebastian Markbåge
+redirect_from: "blog/2014/10/14/introducting-react-elements.html"
 ---
 
 The upcoming React 0.12 tweaks some APIs to get us close to the final 1.0 API. This release is all about setting us up for making the `ReactElement` type really FAST, [jest unit testing](http://facebook.github.io/jest/) easier, making classes simpler (in preparation for ES6 classes) and better integration with third-party languages!
@@ -22,7 +23,7 @@ Continue reading if you want all the nitty gritty details...
 
 ## New Terminology
 
-We wanted to make it easier for new users to see the parallell with the DOM (and why React is different). To align our terminology we now use the term `ReactElement` instead of _descriptor_. Likewise, we use the term `ReactNode` instead of _renderable_.
+We wanted to make it easier for new users to see the parallel with the DOM (and why React is different). To align our terminology we now use the term `ReactElement` instead of _descriptor_. Likewise, we use the term `ReactNode` instead of _renderable_.
 
 [See the full React terminology guide.](https://gist.github.com/sebmarkbage/fcb1b6ab493b0c77d589)