Merge #11330: Trivial: Fix comments for DEFAULT_WHITELIST[FORCE]RELAY

Summary:
dc2f737ae Trivial: Fix comments for DEFAULT_WHITELIST[FORCE]RELAY (danra)

Pull request description:

Tree-SHA512: 1156a34f19be81029e736a672df4eda4578ccfea2b3446356c071409db2652e4517246a8e4c23f7c2bf3d6cd8c61501db05fbf6628c1c55ca8f9e04107f3eab8

Backport of Core PR11330
https://github.com/bitcoin/bitcoin/pull/11330

Test Plan:

make check

Reviewers: deadalnix, Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Reviewed By: jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D3660