doc,dgram: fix addMembership documentation#7244
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Checklist
make -j4 test(UNIX) orvcbuild test nosign(Windows) passesAffected core subsystem(s)
doc,dgram
Description of change
Adding membership using
IP_ADD_MEMBERSHIPwith interface address setto
INADDR_ANYforIPv4or as an index of0forIPv6leads tousing only one interface selected by the operating system.
Fixes: #1692
From Stevens UNIX Network Programming
On Windows from https://msdn.microsoft.com/en-us/library/windows/desktop/ms738695%28v=vs.85%29.aspx