Add missing information on multicasting with high data rates to PGM docs #3521
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Problem: PGM doc missing info on high data rates
Solution: Include a new section on configuring both ZMQ and the host
OS tx/rx buffers to facilitate sending large messages at a high data
rate with the PGM protocol.
Issue #2076 discusses problems that were encountered when attempting to multicast high data rates with the PGM protocol. There are some settings on both ZMQ and the host OS that must be changed in order to successfully multicast with higher rates. These setting changes have been added to the docs on PGM.
Please let me know if anything should be reformatted/moved to another place in the doc file.