Issue #3192365 by Symbioquine, tbradbury, mxr576, alexpott, longwave: Race Condition in 'public://simpletest' mkdir Call

Issue #2042239 by tbradbury, pkiraly, lucaslg, pjonckiere, oriol_e9g, ivanchaer, jhodgdon, chx, cilefen, David_Rothstein: DeleteQuery::execute (Delete::execute() in D8) return value documentation is unusable

Issue #2470145 by David_Rothstein, rbmboogie, tbradbury, johnpicozzi, ifrik: Fix text for update manager checkbox for disabled extensions

Issue #2428861 by tbradbury, Nitesh Sethia, neetu morwani, deepakaryan1988, Sagar Ramgade, yogen.prasad, Daniel_Rose, Cottser, jhodgdon, Sutharsan, leeotzu: user.html.twig documentation refers to a nonexistent 'account' variable