docs: fix typo in specs/src/cat_pool.md (#4061)

## Overview

This PR fixes a typo in the `specs/src/cat_pool.md` file, changing
`transacton` to `transaction`. This is important for maintaining
accurate and professional documentation, ensuring clarity and preventing
confusion for users and developers.

specs/src/cat_pool.md

@@ -53,7 +53,7 @@ A node in the protocol has two distinct modes: "broadcast" and "request/response
 A `SeenTx` is broadcasted to ALL nodes upon receiving a "new" transaction from a peer. The transaction pool does not need to track every unique inbound transaction, therefore "new" is identified as:
 
 - The node does not currently have the transaction
-- The node did not recently reject the transacton or has recently seen the same transaction committed (subject to the size of the cache)
+- The node did not recently reject the transaction or has recently seen the same transaction committed (subject to the size of the cache)
 - The node did not recently evict the transaction (subject to the size of the cache)
 
 Given this criteria, it is feasible, yet unlikely that a node receives two `SeenTx` messages from the same peer for the same transaction.