Typo fix: "satsify" -> "satisfy"

library/alloc/src/vec.rs

@@ -412,7 +412,7 @@ impl<T> Vec<T> {
     ///   (at least, it's highly likely to be incorrect if it wasn't).
     /// * `T` needs to have the same size and alignment as what `ptr` was allocated with.
     ///   (`T` having a less strict alignment is not sufficient, the alignment really
-    ///   needs to be equal to satsify the [`dealloc`] requirement that memory must be
+    ///   needs to be equal to satisfy the [`dealloc`] requirement that memory must be
     ///   allocated and deallocated with the same layout.)
     /// * `length` needs to be less than or equal to `capacity`.
     /// * `capacity` needs to be the capacity that the pointer was allocated with.