Fix MDBOOK_BOOK environment variable example

ehuss · web-flow · commit 9764f8886bcf · 2022-12-28T19:21:38.000-08:00
diff --git a/guide/src/format/configuration/environment-variables.md b/guide/src/format/configuration/environment-variables.md
@@ -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
 > ```
 

Original file line number	Diff line number	Diff line change
@@ -29,7 +29,7 @@ book's title without needing to touch your `book.toml`.
`29`	`29`	`> building the book with something like`
`30`	`30`	`>`
`31`	`31`	> ```shell
`32`		`-> $ export MDBOOK_BOOK="{'title': 'My Awesome Book', authors: ['Michael-F-Bryan']}"`
	`32`	`+> $ export MDBOOK_BOOK='{"title": "My Awesome Book", "authors": ["Michael-F-Bryan"]}'`
`33`	`33`	`> $ mdbook build`
`34`	`34`	> ```
`35`	`35`