fix typos

src/libcore/intrinsics.rs

@@ -1159,7 +1159,7 @@ extern "rust-intrinsic" {
     /// // At this point, using or dropping `v` results in undefined behavior.
     /// // drop(v); // ERROR
     ///
-    /// // Even leaking `v` "uses" it, and henc eis undefined behavior.
+    /// // Even leaking `v` "uses" it, and hence is undefined behavior.
     /// // mem::forget(v); // ERROR
     ///
     /// unsafe {

src/libcore/ptr.rs

@@ -47,7 +47,7 @@
 //! ## Alignment
 //!
 //! Valid raw pointers as defined above are not necessarily properly aligned (where
-//! "proper" alignment is defind by the pointee type, i.e., `*const T` must be
+//! "proper" alignment is defined by the pointee type, i.e., `*const T` must be
 //! aligned to `mem::align_of::<T>()`). However, most functions require their
 //! arguments to be properly aligned, and will explicitly state
 //! this requirement in their documentation. Notable exceptions to this are