chore: update comment on torchao shim strategy

Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /app
 
 RUN apt-get update && apt-get install -y git build-essential && rm -rf /var/lib/apt/lists/*
 
-# Stable cu121 torch — register_constant shim applied at runtime for torchao compat
+# Stable cu121 torch — TorchAO import shims are applied at runtime before Unsloth loads.
 RUN pip install --no-cache-dir \
     torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu121 && \
     pip install --no-cache-dir \