Add missing backticks (#566)

[ci skip]

Author: jonas-schulze

src/reflection.jl

@@ -274,7 +274,7 @@ end
 """
     @device_code_llvm [io::IO=stdout, ...] ex
 
-Evaluates the expression `ex` and prints the result of InteractiveUtils.code_llvm
+Evaluates the expression `ex` and prints the result of `InteractiveUtils.code_llvm`
 to `io` for every compiled GPU kernel. For other supported keywords, see
 [`GPUCompiler.code_llvm`](@ref).