Rollup merge of #60536 - brainplot:fix-unicode-character, r=dtolnay

Correct code points to match their textual description

Probably due to a copy-paste error, in the sentence

> For example, despite looking similar, the 'é' character is one Unicode code point while 'é' is two Unicode code points:

the two `é`'s were actually the same character in the text (i.e. the same Unicode character U+00E9).
The code listing below instead had two different Unicode characters for the two `é`s, as it was supposed to.
The example shown wasn't clear at first so I started inspecting the text and found this out.
I simply copied the character from the code listing to the description surrounding the code.
It's a minor thing but I thought it would make things clearer for others, especially since the example is about how Rust handles `char`s.

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