Fix MDBOOK_BOOK environment variable example
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@ -29,7 +29,7 @@ book's title without needing to touch your `book.toml`.
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> building the book with something like
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> building the book with something like
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>
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>
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> ```shell
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> ```shell
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> $ export MDBOOK_BOOK="{'title': 'My Awesome Book', authors: ['Michael-F-Bryan']}"
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> $ export MDBOOK_BOOK='{"title": "My Awesome Book", "authors": ["Michael-F-Bryan"]}'
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> $ mdbook build
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> $ mdbook build
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> ```
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> ```
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