[docs] Add reminder to open lightning ports

README.md

@@ -53,7 +53,7 @@ Note: The setup process can be time consuming, but is heavily automated to make
 
 You can also install BTCPayServer on your own machine or VPS instance.
 
-First, make sure you have a domain name pointing to your host, with ports `443` and `80` externally accessible.
+First, make sure you have a domain name pointing to your host, with ports `443` and `80` externally accessible (and perhaps additional ports like `9735` and `9736` for Bitcoin and Litecoin lightning).
 
 Let's assume it is `btcpay.example.com`.
 
@@ -106,14 +106,14 @@ exit
 * `BTCPAYGEN_LIGHTNING`: Lightning network implementation to use (eg. `clightning`, `(empty)`)
 * `BTCPAYGEN_SUBNAME`: The subname of the generated docker-compose file, where the full name is `Generated/docker-compose.SUBNAME.yml` (Default: `generated`)
 * `BTCPAYGEN_ADDITIONAL_FRAGMENTS`: Semicolon-separated list of additional fragments you want to use (eg. `opt-save-storage`)
-* `LETSENCRYPT_EMAIL`: An email will be sent to this address if certificate expires and fail to renew automatically (eg. `me@example.com`)
+* `LETSENCRYPT_EMAIL`: An email will be sent to this address if certificate expires and fails to renew automatically (eg. `me@example.com`)
 * `ACME_CA_URI`: The API endpoint to ask for HTTPS certificate (Default: `https://acme-v01.api.letsencrypt.org/directory`)
 * `BTCPAY_HOST_SSHKEYFILE`: Optional, SSH private key that BTCPay can use to connect to this VM's SSH server. This key will be copied to BTCPay's data directory
 * `BTCPAY_SSHTRUSTEDFINGERPRINTS`: Optional, BTCPay will ensure that it is connecting to the expected SSH server by checking the host's public key against these fingerprints
 
 # Tooling
 
-A wide variety of scripts are available once BTCPay is installed:
+A wide variety of useful scripts are available once BTCPay is installed:
 
 * `bitcoin-cli.sh`: Access your Bitcoin node instance (for RPC)
 * `bitcoin-lightning-cli.sh`: Access your C-Lightning node instance (for RPC)