api.md: update preview example
The implementation of the preview function has changed since the
API was documented, update the document to match.
@@ -471,15 +471,16 @@ Determines what rules match for a user on an ACL without saving the ACL to the s
##### Parameters
###### Query Parameters
-`user` - A user's email. The provided ACL is queried with this user to determine which rules match.
+`type` - can be 'user' or 'ipport'
+`previewFor` - if type=user, a user's email. If type=ipport, a IP address + port like "10.0.0.1:80".
+The provided ACL is queried with this paramater to determine which rules match.
###### POST Body
ACL JSON or HuJSON (see https://tailscale.com/kb/1018/acls)
##### Example
```
-POST /api/v2/tailnet/example.com/acl/preiew
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl?user=user1@example.com' \
+curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl/preview?previewFor=user1@example.com&type=user' \
-u "tskey-yourapikey123:" \
--data-binary '// Example/default ACLs for unrestricted connections.
{
