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chore(doctest): Remove redundant blank lines Remove redundant leading blank lines from doctests of [`iN::cast_unsigned`](https://doc.rust-lang.org/std/primitive.i32.html#method.cast_unsigned), [`slice::escape_ascii`](https://doc.rust-lang.org/std/primitive.slice.html#method.escape_ascii) and [`u8::escape_ascii`](https://doc.rust-lang.org/std/primitive.u8.html#method.escape_ascii).