use correct lld

rust-lang/rust#51936

Author: steveklabnik

second-edition/src/appendix/target-specifications.md

@@ -58,6 +58,7 @@ We're not using C, so this doesn't matter, but if we were, we'd make integers
 We don't have an OS! We're building one!
 
 ```json
+  "linker": "rust-lld",
   "linker-flavor": "ld.lld",
 ```
 

second-edition/src/hello-world/setting-up-a-project.md

@@ -97,6 +97,7 @@ Create a new file named `intermezzos.json` and put this in it:
   "target-pointer-width": "64",
   "target-c-int-width": "32",
   "os": "none",
+  "linker": "rust-lld",
   "linker-flavor": "ld.lld",
   "executables": true,
   "features": "-mmx,-sse,+soft-float",
@@ -345,4 +346,4 @@ documentation](https://github.com/rust-osdev/bootimage#configuration).
 
 Congrats! This is the first step on our journey building operating systems.
 It only gets cooler from here. But before we move on, let's take a step back
-and investigate in a bit more depth what we actually just did.
+and investigate in a bit more depth what we actually just did.