Add additional slash to show ReceivePayjoin cli docs #1035

Job	Run time
Clippy (--all-features)	1m 17s
Build and test (stable, --features default)	52s
Build and test (stable, --no-default-features)	54s
Build and test (stable, --all-features)	2m 6s
Clippy (--no-default-features)	1m 7s
Rust fmt	19s
	6m 35s

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