chore[fuzzer]: update readme (#3581)

Author: joseph-isaacs

fuzz/README.md

@@ -1,4 +1,3 @@
-
 # Vortex Fuzz
 
 This crate contains general fuzzing infrastructure and tooling for all public components of Vortex.
@@ -9,4 +8,10 @@ Currently, the only thing required to run the fuzzing targets is [`cargo-fuzz`](
 
 ## Reproduce crash from CI
 
-In the case of a crash in the nightly run, you can download the crash artifact and run `cargo-fuzz` with the exact same input with the command `cargo fuzz run array_ops <path/to/artifact>`
+In the case of a crash in the nightly run, you can download the crash artifact and run `cargo-fuzz` with the exact same
+input with the command `cargo fuzz run array_ops/file_io <path/to/artifact>`
+
+### ASAN
+
+If there are any linking (on macOS) then run `cargo fuzz run --dev --sanitizer=none ...`. `--dev` runs the fuzzer in dev
+profile.