docs: generate list items as * instead of - in text

[mmatczuk]

There is already lots of hyphens * would be less distracting.

Example

    --tunnel-tls-key-file <path or base64> (env SC_SERVER_TUNNEL_TLS_KEY_FILE)
        TLS private key to use if the server protocol is https or h2. 
        
        Syntax:
        - File: /path/to/file.pac
        - Embed: data:base64,<base64 encoded data>