token in CLI login docs

Author: Wauplin

docs/source/guides/upload.mdx

@@ -13,6 +13,8 @@ Whenever you want to upload files to the Hub, you need to log in to your Hugging
 
   ```bash
   huggingface-cli login
+  # or using an environment variable
+  huggingface-cli login --token $HUGGINGFACE_TOKEN
   ```
 
 - Alternatively, you can programmatically login using [`login`] in a notebook or a script:

docs/source/quick-start.mdx

@@ -60,6 +60,8 @@ Once you have your User Access Token, run the following command in your terminal
 
 ```bash
 huggingface-cli login
+# or using an environment variable
+huggingface-cli login --token $HUGGINGFACE_TOKEN
 ```
 
 Alternatively, you can programmatically login using [`login`] in a notebook or a script: