docs(idna): repeated word 'the the mechanism'

[extua]

In the explanation for Uts46::to_user_interface, the word 'the' is repeated twice on a line break.

rust-url/idna/src/uts46.rs

Lines 629 to 630 in dbd5261

	/// However, since this mechanism is common practice, this API provides support for The
	/// the mechanism.

And again in the explanation of Uts46::process.

rust-url/idna/src/uts46.rs

Lines 765 to 766 in dbd5261

	/// However, since this mechanism is common practice, this API provides support for the
	/// the mechanism.