correct long line

Author: nikomatsakis

src/libcore/core.rc

@@ -13,11 +13,11 @@ built-in types and runtime services, or that is used in nearly every
 non-trivial program.
 
 `core` includes modules corresponding to each of the integer types, each of
-the floating point types, the `bool` type, tuples, characters, strings, vectors
-(`vec`), shared boxes (`box`), and unsafe pointers (`ptr`).  Additionally,
-`core` provides very commonly used built-in types and operations, concurrency
-primitives, platform abstractions, I/O, and complete bindings to the C
-standard library.
+the floating point types, the `bool` type, tuples, characters, strings,
+vectors (`vec`), shared boxes (`box`), and unsafe pointers (`ptr`).
+Additionally, `core` provides very commonly used built-in types and
+operations, concurrency primitives, platform abstractions, I/O, and complete
+bindings to the C standard library.
 
 `core` is linked by default to all crates and the contents imported.
 Implicitly, all crates behave as if they included the following prologue: