My node tried to rebuild one of them because it was lagging (I noticed because mrkd was not installed). Turns out a few were lagging, and lightning-dev-sendcustommsg.7 was totally empty! Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's a dev-* command for now, but better document it so people can use it rather than having them guess how it's supposed to work.