Fix section in known_hosts documentation

SSHD is part of section 8, SSH is part of section 1.

lib/ansible/modules/system/known_hosts.py

@@ -32,7 +32,7 @@ options:
   key:
     description:
       - The SSH public host key, as a string (required if state=present, optional when state=absent, in which case all keys for the host are removed).
-        The key must be in the right format for ssh (see sshd(1), section "SSH_KNOWN_HOSTS FILE FORMAT")
+        The key must be in the right format for ssh (see sshd(8), section "SSH_KNOWN_HOSTS FILE FORMAT")
     required: false
     default: null
   path: