Rollup merge of #37956 - tshepang:patch-2, r=steveklabnik
book: replace example I do not understand
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@ -460,8 +460,9 @@ not actually pass as a test.
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```
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The `no_run` attribute will compile your code, but not run it. This is
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important for examples such as "Here's how to start up a network service,"
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which you would want to make sure compile, but might run in an infinite loop!
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important for examples such as "Here's how to retrieve a web page,"
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which you would want to ensure compiles, but might be run in a test
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environment that has no network access.
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### Documenting modules
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