Removing related links hatnotes from preview output

See https://en.wikipedia.org/wiki/Template:Rellink
As used in https://en.wikipedia.org/wiki/Liu_Shaoqi for example.
Also improving comments.

Change-Id: I09e7f6b66bd77bea25c072938c53f43b0ec17b08
Merge "Removing related links hatnotes from preview output"