Do not mention OTP 28 yet on v1.18

Author: josevalim

lib/elixir/pages/references/compatibility-and-deprecations.md

@@ -42,7 +42,7 @@ Erlang/OTP versioning is independent from the versioning of Elixir. Erlang relea
 
 Elixir version | Supported Erlang/OTP versions
 :------------- | :-------------------------------
-1.18           | 25 - 27 (and Erlang/OTP 28 from v1.18.4)
+1.18           | 25 - 27
 1.17           | 25 - 27
 1.16           | 24 - 26
 1.15           | 24 - 26