Fix typo

blog/content/second-edition/posts/10-heap-allocation/index.md

@@ -251,7 +251,7 @@ It defines the two required methods [`alloc`] and [`dealloc`], which correspond
 
 The trait additionally defines the two methods [`alloc_zeroed`] and [`realloc`] with default implementations:
 
-- The [`alloc_zeroed`] method is equivalent to calling `alloc` and then setting the allocated memory block to zero, which is exactly what the provided default implementation does. An allocator implementations can override the default implementations with a more efficient custom implementation if possible.
+- The [`alloc_zeroed`] method is equivalent to calling `alloc` and then setting the allocated memory block to zero, which is exactly what the provided default implementation does. An allocator implementation can override the default implementations with a more efficient custom implementation if possible.
 - The [`realloc`] method allows to grow or shrink an allocation. The default implementation allocates a new memory block with the desired size and copies over all the content from the previous allocation. Again, an allocator implementation can probably provide a more efficient implementation of this method, for example by growing/shrinking the allocation in-place if possible.
 
 [`alloc_zeroed`]: https://doc.rust-lang.org/alloc/alloc/trait.GlobalAlloc.html#method.alloc_zeroed