fix: update github url for llvm
Although this fix is not needed (GitHub can operate the change of Organization name), I think it would be a more helpful guide.
@@ -108,7 +108,7 @@ package manager, including Homebrew on macOS.
We have the build more or less fully automated, just three simple steps:
- git clone https://github.com/lumen/llvm-project
+ git clone https://github.com/GetFirefly/llvm-project
cd llvm-project
git checkout firefly
make llvm-shared
