guidance comment to online url for students seeing markdown in NetBeans

specifications/README.md

 # Specification Documents, IEEE and SISO
 # Distributed Interactive Simulation (DIS) Protocol
 
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 *Distributed Interactive Simulation (DIS) is an 
 [Institute of Electrical and Electronics Engineers (IEEE)](https://www.ieee.org) standard for conducting 
 real-time platform-level wargaming across multiple host computers and is used worldwide,