docs: fix htlc states description regarding direction

[daywalker90]

Either i fixed it correctly or alot more is wrong.

From the listhtlcs/wait schema description:

state (string) (one of "SENT_ADD_HTLC", "SENT_ADD_COMMIT", "RCVD_ADD_REVOCATION", "RCVD_ADD_ACK_COMMIT", "SENT_ADD_ACK_REVOCATION", "RCVD_REMOVE_HTLC", "RCVD_REMOVE_COMMIT", "SENT_REMOVE_REVOCATION", "SENT_REMOVE_ACK_COMMIT", "RCVD_REMOVE_ACK_REVOCATION", "RCVD_ADD_HTLC", "RCVD_ADD_COMMIT", "SENT_ADD_REVOCATION", "SENT_ADD_ACK_COMMIT", "RCVD_ADD_ACK_REVOCATION", "SENT_REMOVE_HTLC", "SENT_REMOVE_COMMIT", "RCVD_REMOVE_REVOCATION", "RCVD_REMOVE_ACK_COMMIT", "SENT_REMOVE_ACK_REVOCATION"): The first 10 states are for in, the next 10 are for out.

This does not fit the output of the rpc commands and i believe the sentence should be The first 10 states are for out, the next 10 are for in. (please double check if this is correct!)

I also made the newly added (25.05) htlcs subsystem in wait use the HtlcState primitive and while i was at it added some Display traits.

Important

25.05 FREEZE MAY 05TH: Non-bugfix PRs not ready by this date will wait for 25.08.

RC1 is scheduled on May 12th, RC2 on May 16th, ...

The final release is on MAY 20TH.

Checklist

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• The changelog has been updated in the relevant commit(s) according to the guidelines.
• Tests have been added or modified to reflect the changes.
• Documentation has been reviewed and updated as needed.
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[cdecker]

Looking good, it should only impact the human readable outputs and align much better with the docs 👍

ACK

[rustyrussell]

Trivial rebase on master.