Missing "how"?

[rasimv]

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URL to the section(s) of the book with this problem:
https://github.com/rust-lang/book/blob/main/src/ch12-03-improving-error-handling-and-modularity.md

Description of the problem:
"how" is missing perhaps in
"Any code that uses these values knows to find them in the config instance in the fields named for their purpose"

Suggested fix: