Typo in environment file reference (.venv instead of .env) #minor

[schwentker]

In the "Create Metadata Template" section, there's a typo in the comment:

Current:

# Once the Metadata Template is created, we will write the template key to our .venv file.

Should be:
python# Once the Metadata Template is created, we will write the template key to our .env file.

The code correctly writes to .env but the comment incorrectly references .venv (which is the virtual environment directory).

This is a minor but potentially confusing documentation error that could mislead users about where the configuration is stored.