doc: clarify consequences of `lib.meta.setName`

  dontDistribute = drv: addMetaAttrs { hydraPlatforms = []; } drv;

  /* Change the symbolic name of a package for presentation purposes

     (i.e., so that nix-env users can tell them apart).

  /*

  Change the [symbolic name of a derivation](https://nixos.org/manual/nix/stable/language/derivations.html#attr-name).

  :::{.warning}

  Dependent derivations will be rebuilt when the symbolic name is changed.

  :::

  */

  setName = name: drv: drv // {inherit name;};