Merge ElementsProject/rust-elements#242: doc: fix CheckHrpstring::new… #572

Job	Run time
Test - stable toolchain	2m 53s
Prepare	3s
Check WASM	32s
Docs - stable toolchain (recent)	58s
Docs - nightly toolchain (recent)	37s
Test - MSRV	9m 26s
Lint - nightly toolchain (recent)	39s
Test - nightly toolchain	2m 48s
	17m 56s

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