Mention usage of related finetunes (#1223)

Author: rasbt

tutorials/download_model_weights.md

@@ -154,6 +154,16 @@ unsloth/Mistral-7B-v0.2
 > [!TIP]
 > To sort the list above by model name after the `/`, use `litgpt download | sort -f -t'/' -k2`.
 
+ 
+
+> [!NOTE]
+> If you want to adopt a model variant that is not listed in the table above but has a similar architecture as one of the supported models, you can use this model by by using the `--model_name` argument as shown below:
+> ```bash
+> litgpt download \
+>  --repo_id NousResearch/Hermes-2-Pro-Mistral-7B \
+>  --model_name Mistral-7B-v0.1
+> ```
+
 
  
 ### 2. Download Model Weights