Merge branch 'dd/no-gpg-sign'

"git rebase" learned the "--no-gpg-sign" option to countermand commit.gpgSign the user may have. * dd/no-gpg-sign: Documentation: document merge option --no-gpg-sign Documentation: merge commit-tree --[no-]gpg-sign Documentation: reword commit --no-gpg-sign Documentation: document am --no-gpg-sign cherry-pick/revert: honour --no-gpg-sign in all case rebase.c: honour --no-gpg-sign