doc: stdenv: document meta.mainProgram

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A list of the maintainers of this Nix expression. Maintainers are defined in [`nixpkgs/maintainers/maintainer-list.nix`](https://github.com/NixOS/nixpkgs/blob/master/maintainers/maintainer-list.nix). There is no restriction to becoming a maintainer, just add yourself to that list in a separate commit titled “maintainers: add alice”, and reference maintainers with `maintainers = with lib.maintainers; [ alice bob ]`.
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### `mainProgram` {#var-meta-mainProgram}
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The name of the main binary for the package. This effects the binary `nix run` executes and falls back to the name of the package. Example: `"rg"`
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### `priority` {#var-meta-priority}
The *priority* of the package, used by `nix-env` to resolve file name conflicts between packages. See the Nix manual page for `nix-env` for details. Example: `"10"` (a low-priority package).