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Fix MDBOOK_BOOK environment variable example #1968

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Dec 29, 2022
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Fix MDBOOK_BOOK environment variable example #1968

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2 changes: 1 addition & 1 deletion guide/src/format/configuration/environment-variables.md
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Expand Up @@ -29,7 +29,7 @@ book's title without needing to touch your `book.toml`.
> building the book with something like
>
> ```shell
> $ export MDBOOK_BOOK="{'title': 'My Awesome Book', authors: ['Michael-F-Bryan']}"
> $ export MDBOOK_BOOK='{"title": "My Awesome Book", "authors": ["Michael-F-Bryan"]}'
> $ mdbook build
> ```

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