docs(API-CHANGELOG): add XRPFees change (#4741)

* Add a new API Changelog section for release 1.10.
* Mark `jss::fee_ref` as deprecated.
* Fix a copy-paste error in one of the unit tests.

Author: ximinez

API-CHANGELOG.md

@@ -98,6 +98,17 @@ Additions are intended to be non-breaking (because they are purely additive).
 - Added `NFTokenPages` to the `account_objects` RPC. (https://github.com/XRPLF/rippled/pull/4352)
 - Fixed: `marker` returned from the `account_lines` command would not work on subsequent commands. (https://github.com/XRPLF/rippled/pull/4361)
 
+## XRP Ledger version 1.10.0
+
+[Version 1.10.0](https://github.com/XRPLF/rippled/releases/tag/1.10.0)
+was released on Mar 14, 2023.
+
+### Breaking changes in 1.10
+
+- If the `XRPFees` feature is enabled, the `fee_ref` field will be
+  removed from the [ledger subscription stream](https://xrpl.org/subscribe.html#ledger-stream), because it will no longer
+  have any meaning.
+
 # In development
 
 Changes below this point are in development.

src/ripple/protocol/jss.h

@@ -315,7 +315,7 @@ JSS(fee_base);              // out: NetworkOPs
 JSS(fee_div_max);           // in: TransactionSign
 JSS(fee_level);             // out: AccountInfo
 JSS(fee_mult_max);          // in: TransactionSign
-JSS(fee_ref);               // out: NetworkOPs
+JSS(fee_ref);               // out: NetworkOPs, DEPRECATED
 JSS(fetch_pack);            // out: NetworkOPs
 JSS(first);                 // out: rpc/Version
 JSS(firstSequence);         // out: NodeToShardStatus

src/test/app/TxQ_test.cpp

@@ -4843,13 +4843,13 @@ class TxQ1_test : public beast::unit_test::suite
                     drops[jss::base_fee] == "0");
                 BEAST_EXPECT(
                     drops.isMember(jss::median_fee) &&
-                    drops[jss::base_fee] == "0");
+                    drops[jss::median_fee] == "0");
                 BEAST_EXPECT(
                     drops.isMember(jss::minimum_fee) &&
-                    drops[jss::base_fee] == "0");
+                    drops[jss::minimum_fee] == "0");
                 BEAST_EXPECT(
                     drops.isMember(jss::open_ledger_fee) &&
-                    drops[jss::base_fee] == "0");
+                    drops[jss::open_ledger_fee] == "0");
             }
         }