fix typo in stable doc codegen-options chapter

Author: lqd

src/doc/rustc/src/codegen-options/index.md

@@ -221,7 +221,7 @@ metrics.
 ## link-self-contained
 
 On `windows-gnu`, `linux-musl`, and `wasi` targets, this flag controls whether the
-linker will use libraries and objects shipped with Rust instead or those in the system.
+linker will use libraries and objects shipped with Rust instead of those in the system.
 It takes one of the following values:
 
 * no value: rustc will use heuristic to disable self-contained mode if system has necessary tools.