stdenv.md: Clarify overrideAttrs sentence

I weirded my English.

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doc
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doc/stdenv/stdenv.chapter.md
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### Recursive attributes in `mkDerivation`
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If you pass a function to `mkDerivation`, it will receive as its argument the final arguments, considering use of `overrideAttrs`. For example:
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If you pass a function to `mkDerivation`, it will receive as its argument the final arguments, including the overrides when reinvoked via `overrideAttrs`. For example:
```nix
mkDerivation (finalAttrs: {