A lot more documentation.

docs/add_wireguard_interface.md

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+# `add_wireguard_interface` Command
+
+## Name
+
+`add_wireguard_interface` or `add_wireguard_interfaces`
+
+## Synopsis
+
+`add_wireguard_interface ${wireguard_name} [${wireguard_name}]...`
+
+## Description
+
+Adds the specified wireguard interface name (`${wireguard_name}`) to the
+`wireguard_interfaces` variable in `rc.conf`.  Wireguard interfaces need
+not be numbered sequentially.  As usual, `/usr/local/etc/wireguard/wg0.conf`
+and so forth are used to define the configuration for that tunnel.
+
+`add_wireguard_interfaces` exists as a convenience/readability alias to make
+configuration lines which add multiple wireguard interfaces less ambiguous.
+
+## Examples
+
+#### Add a single wireguard interface
+
+`add_wireguard_interface wg0`
+
+#### Add wireguard interfaces for 0 and 1 and 2
+
+`add_wireguard_interfaces 0 1 2`
+
+## See Also
+
+ - [`add_vlan`](add_vlan.md)
+ - [`clone_interface`](clone_interface.md)