[TRTLLM-7971][doc] Doc update for multimodal in v1.1#9015

schetlur-nv merged 1 commit intoNVIDIA:release/1.1NVIDIA/TensorRT-LLM:release/1.1from

chang-l:mm_doc_update_1.1_relchang-l/TensorRT-LLM:mm_doc_update_1.1_relCopy head branch name to clipboard