Fix fundamentally incorrect assertions in NIP-66 (#2067)

Author: dskvr

66.md

@@ -28,10 +28,8 @@ Other tags include:
 - `N` - NIPs supported by the relay
 - `R` - Keys corresponding to requirements per [NIP 11](https://github.com/nostr-protocol/nips/blob/master/11.md)'s `limitations` array, including `auth`, `writes`, `pow`, and `payment`. False values should be specified using a `!` prefix, for example `!auth`.
 - `t` - A topic associated with this relay
-- `k` - An event kind accepted by the relay
-- `!k` - An event kind not accepted by the relay
+- `k` - Accepted and unaccepted kinds (false values prepended by `!`) 
 - `g` - A [NIP-52](https://github.com/nostr-protocol/nips/blob/master/52.md) geohash
-- `l` - A language tag
 
 Tags with more than one value should be repeated, rather than putting all values in a single tag, for example `[["t", "cats"], ["t", "dogs"]]`, rather than `[["t", "cats", "dogs"]]`.