5b4283cb81b5d3023b9868d121b22b1f387a50ca Add comment describing fDisconnect behavior (Carl Dong)
Pull request description:
Motivated by @Sjors here: https://github.com/bitcoin/bitcoin/pull/14605#discussion_r248384309
Tree-SHA512: 8fc52eb4d3b5651c19c49b47fad75e8fb939cf524ada647e88d8d5aad7726052d94e500c1ebdb2a41b67bc4669ee61ff151a5cff81a52c68c900da562ef21751
Backport of core PR15194.