expr: Fix a warning in the doc generation (#2900)

```
warning: this URL is not a hyperlink
```
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Sylvestre Ledru 2022-01-21 23:14:05 +01:00 committed by GitHub
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@ -7,7 +7,7 @@
//!
//! Here we employ shunting-yard algorithm for building AST from tokens according to operators' precedence and associative-ness.
//! * https://en.wikipedia.org/wiki/Shunting-yard_algorithm
//! * `<https://en.wikipedia.org/wiki/Shunting-yard_algorithm>`
//!
// spell-checker:ignore (ToDO) binop binops ints paren prec