Fix typos in posts

Author: jwworth

docs/_posts/2014-10-16-react-v0.12-rc1.md

@@ -41,7 +41,7 @@ We have wanted to do this since before we even open sourced React. No more `/**
 
 The React specific JSX transform no longer transforms to function calls. Instead we use `React.createElement` and pass it arguments. This allows us to make optimizations and better support React as a compile target for things like Om. Read more in the [React Elements introduction](/react/blog/2014/10/14/introducting-react-elements.html).
 
-The result of this change is that we will no longer support arbitrary function calls. We understand that the ability to do was was a convenient shortcut for many people but we believe the gains will be worth it.
+The result of this change is that we will no longer support arbitrary function calls. We understand that the ability to do was a convenient shortcut for many people but we believe the gains will be worth it.
 
 
 ### JSX Lower-case Convention

docs/_posts/2014-11-24-react-js-conf-updates.md

@@ -17,7 +17,7 @@ stick with the originally planned format and venue on Facebook's campus.
 
 Unfortunately, this means that we can only accept a small number of the awesome
 conference talk proposals. In order to make sure attendees get a fair shot at
-registering, we're going to to sell tickets in three separate first-come,
+registering, we're going to sell tickets in three separate first-come,
 first-serve phases. **Tickets will cost $200 regardless of which phase they are
 purchased from and all proceeds will go to charity**.