Documentation HF Token as environment variable in generate scripts (#63)

docs/gpt-in-a-box/kubernetes/v0.2/generating_mar.md

@@ -9,7 +9,7 @@ python3 $WORK_DIR/llm/generate.py [--hf_token <HUGGINGFACE_HUB_TOKEN> --repo_ver
 * **model_name**:       Name of a [validated model](validated_models.md)
 * **output**:           Mount path to your nfs server to be used in the kube PV where model files and model archive file be stored
 * **repo_version**:     Commit ID of model's HuggingFace repository (optional, if not provided default set in model_config will be used)
-* **hf_token**:         Your HuggingFace token. Needed to download LLAMA(2) models.
+* **hf_token**:         Your HuggingFace token. Needed to download LLAMA(2) models. (It can alternatively be set using the environment variable 'HF_TOKEN')
 
 ### Examples  
 The following are example commands to generate the model archive file.  

docs/gpt-in-a-box/vm/v0.3/generating_mar.md

@@ -17,7 +17,7 @@ Where the arguments are :
 - **model_path**:      Absolute path of model files (should be empty if downloading)
 - **mar_output**:      Absolute path of export of MAR file (.mar)
 - **skip_download**:   Flag to skip downloading the model files
-- **hf_token**:        Your HuggingFace token. Needed to download and verify LLAMA(2) models.
+- **hf_token**:        Your HuggingFace token. Needed to download and verify LLAMA(2) models. (It can alternatively be set using the environment variable 'HF_TOKEN')
 
 ## Examples
 The following are example commands to generate the model archive file.