Documentation: HTTPS settings add missing --ssl-keyfile-password (#839)

* adding parameter --ssl-password to decrypt ssl key file

* rever changed to see if build passes

* put back the changes after applying black

* fixing E731 do not assign a lambda expression, use a def

* fix formatting

* amend ssl documentation adding ssl-keyfile-passwor

* remove duplicated text

* amend incomplete documentation about https --ssl-keyfile-password

* fix the parameter https --ssl-keyfile-password type

* refine the parameter --ssl-keyfile-password description

docs/settings.md

@@ -63,6 +63,7 @@ connecting IPs in the `forwarded-allow-ips` configuration.
 ## HTTPS
 
 * `--ssl-keyfile <path>` - SSL key file
+* `--ssl-keyfile-password <str>` - Password to decrypt the ssl key
 * `--ssl-certfile <path>` - SSL certificate file
 * `--ssl-version <int>` - SSL version to use (see stdlib ssl module's)
 * `--ssl-cert-reqs <int>` - Whether client certificate is required (see stdlib ssl module's)