Merge pull request #6 from killercup/patch-1

Fix Typo

Author: Gankra

vec.md

@@ -1,7 +1,7 @@
 % Example: Implementing Vec
 
 To bring everything together, we're going to write `std::Vec` from scratch.
-Because the all the best tools for writing unsafe code are unstable, this
+Because all the best tools for writing unsafe code are unstable, this
 project will only work on nightly (as of Rust 1.2.0).