Explain how to install LLVM on Fedora (GH-118983)

Co-authored-by: Erlend E. Aasland <[email protected]>

Author: hroncok

Tools/jit/README.md

@@ -21,6 +21,12 @@ chmod +x llvm.sh
 sudo ./llvm.sh 18
 ```
 
+Install LLVM 18 on Fedora Linux 40 or newer:
+
+```sh
+sudo dnf install 'clang(major) = 18' 'llvm(major) = 18'
+```
+
 ### macOS
 
 Install LLVM 18 with [Homebrew](https://brew.sh):