Clarification for CERT environment variables

[huygur]

Camunda 8 JS SDK currently accepts following environment variables:

		/** In an environment using self-signed certificates, provide the path to the root certificate */
		CAMUNDA_CUSTOM_ROOT_CERT_PATH: {
			type: 'string',
			optional: true,
		},
		/** When using self-signed certificates, provide the root certificate as a string */
		CAMUNDA_CUSTOM_ROOT_CERT_STRING: {
			type: 'string',
			optional: true,
		},
		/** When using custom or self-signed certificates, provide the path to the certificate chain */
		CAMUNDA_CUSTOM_CERT_CHAIN_PATH: {
			type: 'string',
			optional: true,
		},
		/** When using custom or self-signed certificates, provide the path to the private key */
		CAMUNDA_CUSTOM_PRIVATE_KEY_PATH: {
			type: 'string',
			optional: true,
		},

The use case is currently not clear, and can be mistaken for the following use case:

Zeebe Gateway is encrypted using custom certification

But as discussed before, these environment variables are actually for when mTLS is used.

It will be great to clearly document this in the attached file, or in the project readme.