revert #48337 (`--explain` usage note)#48621

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zackmdavis wants to merge 3 commits intorust-lang:masterfrom

zackmdavis:ui_test_efficiencies

Commits on Feb 28, 2018

Commits on Mar 1, 2018

update UI tests after reverting `--explain` note and double-testing
zackmdavis
committed