doc: use nullish instead of falsy

VoltrexKeyva · VoltrexKeyva · commit 79469a029358 · 2021-07-31T13:07:26.000-07:00
Used nullish instead of falsy to point at that
the parameter now only accepts a `string`,
`null` or `undefined`.
diff --git a/doc/api/dgram.md b/doc/api/dgram.md
@@ -521,7 +521,7 @@ If `msg` is an array, `offset` and `length` must not be specified.
 
 The `address` argument is a string. If the value of `address` is a host name,
 DNS will be used to resolve the address of the host. If `address` is not
-provided or otherwise falsy, `'127.0.0.1'` (for `udp4` sockets) or `'::1'`
+provided or otherwise nullish, `'127.0.0.1'` (for `udp4` sockets) or `'::1'`
 (for `udp6` sockets) will be used by default.
 
 If the socket has not been previously bound with a call to `bind`, the socket
