small typo: either rather than ether on why page

website/source/intro/why.html.markdown

@@ -10,7 +10,7 @@ next_title: "Packer Use Cases"
 
 Pre-baked machine images have a lot of advantages, but most have been unable
 to benefit from them because images have been too tedious to create and manage.
-There were ether no existing tools to automate the creation of machine images or
+There were either no existing tools to automate the creation of machine images or
 they had too high of a learning curve. The result is that, prior to Packer,
 creating machine images threatened the agility of operations teams, and therefore
 aren't used, despite the massive benefits.