Update radix-tree.md

DataStructures/radix-tree.md

@@ -4,7 +4,7 @@ Data Structures in the Linux Kernel
 Radix tree
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-As you already know linux kernel provides many different libraries and functions which implement different data structures and algorithm. In this part we will consider one of these data structures - [Radix tree](http://en.wikipedia.org/wiki/Radix_tree). There are two files which are related to `radix tree` implementation and API in the linux kernel:
+As you already know linux kernel provides many different libraries and functions which implement different data structures and algorithms. In this part we will consider one of these data structures - [Radix tree](http://en.wikipedia.org/wiki/Radix_tree). There are two files which are related to `radix tree` implementation and API in the linux kernel:
 
 * [include/linux/radix-tree.h](https://github.com/torvalds/linux/blob/master/include/linux/radix-tree.h)
 * [lib/radix-tree.c](https://github.com/torvalds/linux/blob/master/lib/radix-tree.c)