Merge #10475: [RPC] getmempoolinfo mempoolminfee is a BTC/KB feerate

f128f78 getmempool mempoolminfee is a BTC/KB feerate (Gregory Sanders)

Tree-SHA512: 5b32ffc0d2ba7ca623d4ce450fb67855d17b4fa8c3ffb8570a63dc53b3d476d52b39ad6190ac4357dbf01f6b535fa187cd8c34175a16469e9b00097e3bf2e2bc

src/rpc/blockchain.cpp

@@ -1325,7 +1325,7 @@ UniValue getmempoolinfo(const JSONRPCRequest& request)
             "  \"bytes\": xxxxx,              (numeric) Sum of all virtual transaction sizes as defined in BIP 141. Differs from actual serialized size because witness data is discounted\n"
             "  \"usage\": xxxxx,              (numeric) Total memory usage for the mempool\n"
             "  \"maxmempool\": xxxxx,         (numeric) Maximum memory usage for the mempool\n"
-            "  \"mempoolminfee\": xxxxx       (numeric) Minimum fee for tx to be accepted\n"
+            "  \"mempoolminfee\": xxxxx       (numeric) Minimum feerate (" + CURRENCY_UNIT + " per KB) for tx to be accepted\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getmempoolinfo", "")