PULL_REQUEST_TEMPLATE.md: clarify a few things

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.github
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.github/PULL_REQUEST_TEMPLATE.md
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###### Things done:
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- [ ] Tested via `nix.useChroot`.
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- [ ] Built on platform(s): .
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- [ ] Tested compilation of all pkgs that depend on this change.
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- [ ] Tested execution of binary products.
- [ ] Fits [CONTRIBUTING.md](https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md).
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###### Extra
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Fixes # .
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cc @ .
---
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_Please note, that points are not mandatory._
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###### Things done:
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- [ ] Tested using sandboxing (`nix-build --option build-use-chroot true` or [nix.useChroot](http://nixos.org/nixos/manual/options.html#opt-nix.useChroot) on NixOS)
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- [ ] Built on platform(s): NixOS + OSX + Linux
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- [ ] Tested compilation of all pkgs that depend on this change using `nix-shell -p nox --run "nox-review wip"`
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- [ ] Tested execution of all binary files (usually in `./result/bin/`)
- [ ] Fits [CONTRIBUTING.md](https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md).
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###### More
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Fixes issue #<insert id>
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cc @<maintainer>
---
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_Please note, that points are not mandatory, but ._