more docs

docs/man/nng_socket.7.adoc

@@ -19,7 +19,7 @@ The ((_socket_ transport)) provides communication support between
 peers across a arbitrary BSD sockets, such as those that are
 created with xref:nng_socket_pair.3supp.adoc[`nng_socket_pair()`].
 
-This transport only supports xref:nng_listener.5.adoc[listeners], using xref:nng_listener_create.3.adoc[`nng_listener_create()].
+This transport only supports xref:nng_listener.5.adoc[listeners], using xref:nng_listener_create.3.adoc[`nng_listener_create()`].
 
 NOTE: Attempts to create a xref:nng_dialer.5.adoc[dialer] using this transport will result in `NNG_ENOTSUP`.
 
@@ -55,12 +55,20 @@ The following transport option is available:
 (int) This is a write-only option, that may be set multiple times on a listener.
 The listener will create a pipe backed by the given file descriptor passed as an argument.
 
+Additionally, the following options may be supported on pipes when the platform supports them:
+
+* xref:nng_options.5.adoc#NNG_OPT_PEER_GID[`NNG_OPT_PEER_GID`]
+* xref:nng_options.5.adoc#NNG_OPT_PEER_PID[`NNG_OPT_PEER_PID`]
+* xref:nng_options.5.adoc#NNG_OPT_PEER_UID[`NNG_OPT_PEER_UID`]
+* xref:nng_options.5.adoc#NNG_OPT_PEER_ZONEID[`NNG_OPT_PEER_ZONEID`]
+
 == SEE ALSO
 
 [.text-left]
 xref:nng_socket_pair.3supp.adoc[nng_socket_pair(3)],
 xref:nng_dialer.5.adoc[nng_dialer(5)],
 xref:nng_listener.5.adoc[nng_listener(5)],
+xref:nng_options.5.adoc[nng_options(5)],
 xref:nng_pipe.5.adoc[nng_pipe(5)],
 xref:nng_sockaddr.5.adoc[nng_sockaddr(5)],
 xref:nng.7.adoc[nng(7)]