Add explanation regarding non-standard port to init.cpp and net.cpp. #5285

1. 
   ghost commented at 10:50 am on November 15, 2014: none
2. Add explanation regarding non-standard ports.

   Adds an explanation to a non-obvious behaviour in the core client,
   where non-standard ports are avoided unless the node is truly desperate
   to find somebody who is still alive and willing to take their
   connection. The original code comment describes the behaviour but not
   the reasoning.
   
   Fix typo.

   76ed8c85b3
3. unknown closed this on Nov 15, 2014

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4. laanwj referenced this in commit cfbfd389f6 on Dec 17, 2020
5. MarcoFalke locked this on Sep 8, 2021

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