Formatted lines that passed 80 chars in types.md

Author: JoshBrudnak

src/types.md

@@ -67,12 +67,12 @@ fn main() {
 
 The machine types are the following:
 
-* The unsigned word types `u8`, `u16`, `u32`, `u64`, and `u128` with values drawn from
-  the integer intervals [0, 2^8 - 1], [0, 2^16 - 1], [0, 2^32 - 1],
+* The unsigned word types `u8`, `u16`, `u32`, `u64`, and `u128` with values
+  drawn from the integer intervals [0, 2^8 - 1], [0, 2^16 - 1], [0, 2^32 - 1],
   [0, 2^64 - 1], and [0, 2^128 - 1] respectively.
 
-* The signed two's complement word types `i8`, `i16`, `i32`, `i64`, and `i128`, with
-  values drawn from the integer intervals [-(2^7), 2^7 - 1],
+* The signed two's complement word types `i8`, `i16`, `i32`, `i64`, and `i128`,
+  with values drawn from the integer intervals [-(2^7), 2^7 - 1],
   [-(2^15), 2^15 - 1], [-(2^31), 2^31 - 1], [-(2^63), 2^63 - 1], and
   [-(2^127), 2^127 - 1] respectively.