docs: clarify MLLM MTP guard semantics#491

Thump604 wants to merge 1 commit intowaybarrios:mainwaybarrios/vllm-mlx:mainfrom

Thump604:fix/issue-489-mtp-review-notesThump604/vllm-mlx:fix/issue-489-mtp-review-notesCopy head branch name to clipboard