Add syslog RFCs to see also

docs/ref/api/index.md

@@ -1,7 +1,20 @@
 # API Reference
 
-This section is a reference guide for the NNG programming interfaces.
+This section is a reference guide for the _NNG_ programming interfaces.
+It is meant to serve as a refernce, rather than as a tutorial.
+
+The material here is organized by major areas of functionality.
+
+Note that unless indicated otherwise, consumers of these interfaces must
+include the `nng/nng.h` header file like so:
+
+```c
+#include <nng/nng.h>
+```
+
+## Chapters
 
 - [Messages](msg/)
 - [Threading and Synchronization](thr/)
+- [Logging](logging.md)
 - [Utility Functions](util/)

docs/ref/api/logging.md

@@ -170,6 +170,16 @@ The {{i:`nng_system_logger`}} attempts to use an appropriate system facility to
 For POSIX systems, this means using `syslog` to process the messages.
 For other systems the defauilt behavior may be the same as `nng_stderr_logger`.
 
+## See Also
+
+The Syslog Protocol upon which this is based is documented in the following two IETF
+RFCS,
+
+- R. Gerhards, [RFC 5424](https://datatracker.ietf.org/doc/html/rfc5424), _The Syslog Protocol_,
+  March 2009
+- C. Lonvick, [RFC 3164](https://datatracker.ietf.org/doc/html/rfc3164), _The BSD syslog Protocol_,
+  August 2001
+
 [log_level]: #log-levels
 [log_facility]: #log-facilities
 [log_logger]: #log-handlers