man: do not include keyctl_pkey_sign(3) in its own 'see also' section

This fixes an endless manual recursion in the "see also" section
of keyctl_pkey_sign(3).

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: David Howells <dhowells@redhat.com>
1 file changed