[config_validation] Fix multicast typo in error message (#17206)

esphome/config_validation.py

@@ -1455,9 +1455,7 @@ def ipv6address(value):
 def ipv4address_multi_broadcast(value):
     address = ipv4address(value)
     if not (address.is_multicast or (address == IPv4Address("255.255.255.255"))):
-        raise Invalid(
-            f"{value} is not a multicasst address nor local broadcast address"
-        )
+        raise Invalid(f"{value} is not a multicast address nor local broadcast address")
     return address