Fix link added in #2495 to be relative and at the bottom

src/ch04-01-what-is-ownership.md

@@ -215,8 +215,8 @@ from Listing 4-1 using a `String` instead of a string literal:
 ```
 
 There is a natural point at which we can return the memory our `String` needs
-to the allocator: when `s` goes out of scope. When a variable goes out
-of scope, Rust calls a special function for us. This function is called [`drop`](https://doc.rust-lang.org/std/ops/trait.Drop.html#tymethod.drop),
+to the allocator: when `s` goes out of scope. When a variable goes out of
+scope, Rust calls a special function for us. This function is called [`drop`],
 and it’s where the author of `String` can put the code to return the memory.
 Rust calls `drop` automatically at the closing curly bracket.
 
@@ -466,3 +466,4 @@ common. Luckily for us, Rust has a feature for this concept, called
 [derivable-traits]: appendix-03-derivable-traits.html
 [method-syntax]: ch05-03-method-syntax.html#method-syntax
 [paths-module-tree]: ch07-03-paths-for-referring-to-an-item-in-the-module-tree.html
+[`drop`]: ../std/ops/trait.Drop.html#tymethod.drop