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

Before submitting the PR, ensure the following tasks are completed. If an item is not applicable to your PR, please mark it as checked:

• 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.
• Related issues have been listed and linked, including any that this PR closes.

[cdecker]

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

ACK