Tool contract 11.18.1

A correction to 11.18.0: elixir_docs and elixir://docs/<page>#<section> follow a moved section when it is asked for by its old title as well as its old slug, so elixir_docs({ page: "recording", section: "Daily series" }) answers again.

The examples in the descriptions of elixir_nickname and players_search use made-up names. No argument, field or error changed.