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Update codegen-backend.md

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src/doc/unstable-book/src/compiler-flags/codegen-backend.md
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@ -8,8 +8,8 @@ This feature allows you to specify a path to a dynamic library to use as rustc's
code generation backend at runtime.
Set the `-Zcodegen-backend=<path>` compiler flag to specify the location of the
backend. The library must contain a function named `__rustc_codegen_backend`
with a signature of `fn() -> Box<dyn rustc_codegen_ssa::traits::CodegenBackend>`.
backend. The library must be of crate type `dylib` and must contain a function
named `__rustc_codegen_backend` with a signature of `fn() -> Box<dyn rustc_codegen_ssa::traits::CodegenBackend>`.
## Example
```rust,ignore