upstream: the download resident keys option is -K (upper) not -k

(lower); ok djm

OpenBSD-Commit-ID: 71dc28a3e1fa7c553844abc508845bcf5766e091

ssh-keygen.1

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: ssh-keygen.1,v 1.187 2020/01/02 22:40:09 djm Exp $
+.\"	$OpenBSD: ssh-keygen.1,v 1.188 2020/01/03 07:33:33 jmc Exp $
 .\"
 .\" Author: Tatu Ylonen <ylo@cs.hut.fi>
 .\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -35,7 +35,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 2 2020 $
+.Dd $Mdocdate: January 3 2020 $
 .Dt SSH-KEYGEN 1
 .Os
 .Sh NAME
@@ -365,7 +365,7 @@ This option allows importing keys from other software, including several
 commercial SSH implementations.
 The default import format is
 .Dq RFC4716 .
-.It Fl k
+.It Fl K
 Download resident keys from a FIDO authenticator.
 Public and private key files will be written to the current directory for
 each downloaded key.