merge bitcoin#24640: Correct description of getblockchaininfo's pruneheight result

Author: kwvg

src/rpc/blockchain.cpp

@@ -1457,7 +1457,7 @@ RPCHelpMan getblockchaininfo()
                 {RPCResult::Type::STR_HEX, "chainwork", "total amount of work in active chain, in hexadecimal"},
                 {RPCResult::Type::NUM, "size_on_disk", "the estimated size of the block and undo files on disk"},
                 {RPCResult::Type::BOOL, "pruned", "if the blocks are subject to pruning"},
-                {RPCResult::Type::NUM, "pruneheight", /* optional */ true, "lowest-height complete block stored (only present if pruning is enabled)"},
+                {RPCResult::Type::NUM, "pruneheight", /* optional */ true, "height of the last block pruned, plus one (only present if pruning is enabled)"},
                 {RPCResult::Type::BOOL, "automatic_pruning", /* optional */ true, "whether automatic pruning is enabled (only present if pruning is enabled)"},
                 {RPCResult::Type::NUM, "prune_target_size", /* optional */ true, "the target size used by pruning (only present if automatic pruning is enabled)"},
                 {RPCResult::Type::OBJ, "softforks", "status of softforks in progress",