Rollup merge of #25909 - frankamp:patch-1, r=steveklabnik

The doc indicates that you can replace 'before' with 'after' showing the use of try!. The two examples should be equivalent, but they are not.

In the File::create we were inducing a panic before in case of error, not propagating. It is important for newbies (like myself) to understand that try! propagates failures, while unwrap can induce a panic.

The other alternative is to make the 'before' File::create also manually handle Err like the other calls. Either way it would be consistent.

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