merge revision(s) af1e487e,6f8ac2cb: [Backport #15801]

	Updated marked commits for ChangeLog


	Include the beginning commit in ChangeLog


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67711 b2dd03c8-39d4-4d8f-98ff-823fe69b080e