bootstrap: Update comment in config.library.toml.

Downloading LLVM from CI works for all platforms now.

Author: BGR360

src/bootstrap/defaults/config.library.toml

@@ -10,6 +10,6 @@ bench-stage = 0
 incremental = true
 
 [llvm]
-# Will download LLVM from CI if available on your platform (Linux only for now)
+# Will download LLVM from CI if available on your platform.
 # https://github.com/rust-lang/rust/issues/77084 tracks support for more platforms
 download-ci-llvm = "if-available"