Fix actions.conf syntax

[Volker-Weissmann]

Currently, docs.rspamd.com recommends invalid syntax for your config files. This PR fixes this.

If I put this in my /etc/rspamd/local.d/actions.conf:

actions = {
    reject = 15;          # Refuse message
    add_header = 6;       # Mark as spam
    greylist = 4;         # Temporary delay
}

configtest complains:

# rspamadm configtest
unknown element in actions section: actions
nested section: actions { actions { ... } }, it is likely a configuration error
action actions has no threshold being set and it is not a no threshold action
rcl parse error: invalid action definition for: 'actions'
syntax BAD

But if I put this in my /etc/rspamd/local.d/actions.conf

reject = 15;          # Refuse message
add_header = 6;       # Mark as spam
greylist = 4;         # Temporary delay

everything seems to work

# rspamadm configtest
syntax OK

[vstakhov]

Yeah, that's a good catch, thank you!