Merge bitcoin/bitcoin#33220: doc: truc packages allow sub min feerate transactions

7270839 doc: truc packages allow sub min feerate transactions (Pol Espinasa)

Pull request description:

  Fixes bitcoin/bitcoin#32067

  Some policy documentation is outdated since TRUC. This PR aims to update the documentation to the actual policy state.

ACKs for top commit:
  w0xlt:
    reACK bitcoin/bitcoin@7270839
  glozow:
    ACK 7270839

Tree-SHA512: 1272e7acc76c76d7e145cdd07827ece31253dba4b99b9a22fc986fcd538830e46392fda877736cb496f3e53a0abcb9d8403d439bb1da63b88da7f8b6f17b6c8b

Author: glozow

doc/policy/packages.md

@@ -116,7 +116,10 @@ rejected from the mempool when transaction volume is high and the mempool minimu
 Note: Package feerate cannot be used to meet the minimum relay feerate (`-minrelaytxfee`)
 requirement. For example, if the mempool minimum feerate is 5sat/vB and the minimum relay feerate is
 set to 5sat/vB, a 1sat/vB parent transaction with a high-feerate child will not be accepted, even if
-submitted as a package.
+submitted as a package. Note that this rule does not apply to
+[TRUC transactions](https://github.com/bitcoin/bips/blob/master/bip-0431.mediawiki) as an individual
+TRUC transaction is permitted to be below the mempool min relay feerate, assuming it is considered within
+a package that meets the mempool's feerate requirements.
 
 *Rationale*: Avoid situations in which the mempool contains non-bumped transactions below min relay
 feerate (which we consider to have pay 0 fees and thus receiving free relay). While package