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Update ch09-03-to-panic-or-not-to-panic.md

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src/ch09-03-to-panic-or-not-to-panic.md
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@ -73,9 +73,9 @@ we'd definitely want to handle the `Result` in a more robust way instead.
### Guidelines for Error Handling ### Guidelines for Error Handling
It's advisable to have your code `panic!` when it's possible that you could end It's advisable to have your code `panic!` when it's possible that you could end
up in a *bad state*---in this context, *bad state* is when some assumption, up in a *bad state*—in this context, *bad state* is when some assumption,
guarantee, contract, or invariant has been broken, such as when invalid values, guarantee, contract, or invariant has been broken, such as when invalid values,
contradictory values, or missing values are passed to your code---plus one or contradictory values, or missing values are passed to your code—plus one or
more of the following: more of the following:
* The bad state is not something that's *expected* to happen occasionally * The bad state is not something that's *expected* to happen occasionally