Add plug-mirror as OpenIndiana mirror

Author: 9p4

docs/handbook/openindiana-download-mirrors.md

@@ -36,4 +36,5 @@ List of DLC Mirrors
 [ftp.nluug.nl/pub/os/openindiana.org](https://ftp.nluug.nl/pub/os/openindiana.org/)   | HTTPS/FTP | Ede, Netherlands    | 1Gbit/s      | NLUUG                                   | [nluug.nl](https://www.nluug.nl/)                         | Up to date
 [mirror.math.princeton.edu/pub/openindiana](https://mirror.math.princeton.edu/pub/openindiana) <br> [mirror.math.princeton.edu/pub/openindiana-iso](https://mirror.math.princeton.edu/pub/openindiana-iso/) | HTTPS/RSYNC | Princeton, NJ (USA)    | 1Gbit/s | Princeton University | [princeton.edu](https://www.princeton.edu/) | Up to date
 [openindiana.mirror-services.net/oi/](https://openindiana.mirror-services.net/oi/)                         | HTTPS/FTP/RSYNC | Leuven, Belgium        | 500Mbit/s      | Team Belgium                     | [mirror-services.net](https://mirror-services.net/) | Up to date
+[plug-mirror.rcac.purdue.edu/openindiana](https://plug-mirror.rcac.purdue.edu/openindiana) | HTTPS/FTP/RSYNC | West Lafayette, IN (USA) | 40Gbit/s | Purdue Linux Users Group    | [purduelug.org](https://purduelug.org)                    | Up to date
 [ftp.gtlib.gatech.edu/pub/OpenIndiana](http://ftp.gtlib.gatech.edu/pub/OpenIndiana/)  | HTTP/FTP/RSYNC  | Atlanta, GA (USA)   | 1Gbit/s      | Georgia Institute of Technology         | [gatech.edu](https://www.gatech.edu/)                     | Last updated 2021