Update fee_estimation.md

update ConfirmationTarget table "mempool.space Category" and "Number of Blocks" recommendation for "AnchorChannelFee"

Author: Beige-Coffee

docs/fee_estimation.md

@@ -50,7 +50,7 @@ A popular approach is to fetch feerate information from a third-party such as me
 | OnChainSweep        |   hour_fee   | 6 |
 | MinAllowedAnchorChannelRemoteFee           |   minimum_fee   | 1008 |
 | MinAllowedNonAnchorChannelRemoteFee    |  economy_fee   | 144 |
-| AnchorChannelFee |  minimum_fee   | 1008 |
+| AnchorChannelFee |  economy_fee   | 144 |
 | NonAnchorChannelFee |  economy_fee   | 12 |
 | ChannelCloseMinimum |  economy_fee   | 144 |
 | OutputSpendingFee |  economy_fee   | 12 |