f doc typo

Author: TheBlueMatt

lightning/src/chain/channelmonitor.rs

@@ -278,8 +278,8 @@ struct HolderSignedTx {
 }
 impl_writeable_tlv_based!(HolderSignedTx, {
 	(0, txid, required),
-	// Note that this is filled in with data from OnchainTxHandler if its missing. For
-	// HolderSignedTx objects serialized with 0.0.100+, this should be filled in.
+	// Note that this is filled in with data from OnchainTxHandler if it's missing.
+	// For HolderSignedTx objects serialized with 0.0.100+, this should be filled in.
 	(1, to_self_value_sat, (default_value, u64::max_value())),
 	(2, revocation_key, required),
 	(4, a_htlc_key, required),