Update blockcode.markdown

block.js -> blocks.js

blockcode/blockcode.markdown

@@ -23,7 +23,7 @@ If you would like to get a feel for what a block-based-language is like, you can
 
 I want to accomplish a couple of things with this code. First and foremost, I want to implement a block language for turtle graphics, with which you can write code to create images through simple dragging-and-dropping of blocks, using as simple a structure of HTML, CSS, and JavaScript as possible. Second, but still important, I want to show how the blocks themselves can serve as a framework for other languages besides our mini turtle language.
 
-To do this, we encapsulate everything that is specific to the turtle language into one file \newline (`turtle.js`) that we can easily swap with another file. Nothing else should be specific to the turtle language; the rest should just be about handling the blocks (`block.js` and `menu.js`) or be generally useful web utilities (`util.js`, `drag.js`, `file.js`). That is the goal, although to maintain the small size of the project, some of those utilities are less general-purpose and more specific to their use with the blocks.
+To do this, we encapsulate everything that is specific to the turtle language into one file \newline (`turtle.js`) that we can easily swap with another file. Nothing else should be specific to the turtle language; the rest should just be about handling the blocks (`blocks.js` and `menu.js`) or be generally useful web utilities (`util.js`, `drag.js`, `file.js`). That is the goal, although to maintain the small size of the project, some of those utilities are less general-purpose and more specific to their use with the blocks.
 
 One thing that struck me when writing a block language was that the language is its own IDE. You can't just code up blocks in your favourite text editor; the IDE has to be designed and developed in parallel with the block language. This has some pros and cons. On the plus side, everyone will use a consistent environment and there is no room for religious wars about what editor to use. On the downside, it can be a huge distraction from building the block language itself.