Update README.md (#1837)

Author: SunnyLi2015

samples/python/text_generation/README.md

@@ -15,7 +15,7 @@ The `--upgrade-strategy eager` option is needed to ensure `optimum-intel` is upg
 Install [../../export-requirements.txt](../../export-requirements.txt) if model conversion is required.
 ```sh
 pip install --upgrade-strategy eager -r ../../export-requirements.txt
-optimim-cli export openvino --model <model> <output_folder>
+optimum-cli export openvino --model <model> <output_folder>
 ```
 If a converted model in OpenVINO IR format is already available in the collection of [OpenVINO optimized LLMs](https://huggingface.co/collections/OpenVINO/llm-6687aaa2abca3bbcec71a9bd) on Hugging Face, it can be downloaded directly via huggingface-cli.
 ```sh