Merge #18344: doc: Fix nit in getblockchaininfo

fb15bfd Fix nit in getblockchaininfo (Steven Roose)

Pull request description:

  Noticed that the statistics are not always shown.

ACKs for top commit:
  laanwj:
    ACK fb15bfd
  promag:
    ACK fb15bfd.

Tree-SHA512: bccbfdff03107d14967f6530eec0bcada7ba8eb16c61b829119533a73f2ead742a0da6a473b7962b15e25cd685c8f155506ab16d4a95b20352d3fd1b4b0164a3

Author: laanwj

src/rpc/blockchain.cpp

@@ -1205,7 +1205,7 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
                                     {RPCResult::Type::NUM_TIME, "start_time", "the minimum median time past of a block at which the bit gains its meaning"},
                                     {RPCResult::Type::NUM_TIME, "timeout", "the median time past of a block at which the deployment is considered failed if not yet locked in"},
                                     {RPCResult::Type::NUM, "since", "height of the first block to which the status applies"},
-                                    {RPCResult::Type::OBJ, "statistics", "numeric statistics about BIP9 signalling for a softfork",
+                                    {RPCResult::Type::OBJ, "statistics", "numeric statistics about BIP9 signalling for a softfork (only for \"started\" status)",
                                     {
                                         {RPCResult::Type::NUM, "period", "the length in blocks of the BIP9 signalling period"},
                                         {RPCResult::Type::NUM, "threshold", "the number of blocks with the version bit set required to activate the feature"},