small changes to rpc command help message strings

src/rpcblockchain.cpp

@@ -410,8 +410,8 @@ Value verifychain(const Array& params, bool fHelp)
             "verifychain ( checklevel numblocks )\n"
             "\nVerifies blockchain database.\n"
             "\nArguments:\n"
-            "1. checklevel   (numeric, optional, default=3) The level\n"
+            "1. checklevel   (numeric, optional, 0-4, default=3) How thorough the block verification is.\n"
-            "2. numblocks    (numeric, optional, 288) The number of blocks\n"
+            "2. numblocks    (numeric, optional, default=288, 0=all) The number of blocks to check.\n"
             "\nResult:\n"
             "true|false       (boolean) Verified or not\n"
             "\nExamples:\n"

src/rpcnet.cpp

@@ -47,7 +47,7 @@ Value ping(const Array& params, bool fHelp)
             "ping\n"
             "\nRequests that a ping be sent to all other nodes, to measure ping time.\n"
             "Results provided in getpeerinfo, pingtime and pingwait fields are decimal seconds.\n"
-            "Ping command is handled in queue with all other commands, so it measures processing backlog, not just network ping."
+            "Ping command is handled in queue with all other commands, so it measures processing backlog, not just network ping.\n"
             "\nExamples:\n"
             + HelpExampleCli("ping", "")
             + HelpExampleRpc("ping", "")

src/rpcwallet.cpp

@@ -1850,9 +1850,9 @@ Value settxfee(const Array& params, bool fHelp)
     if (fHelp || params.size() < 1 || params.size() > 1)
         throw runtime_error(
             "settxfee amount\n"
-            "\nSet the transaction fee per KB.\n"
+            "\nSet the transaction fee per kB.\n"
             "\nArguments:\n"
-            "1. amount         (numeric, required) The transaction fee in BTC/KB rounded to the nearest 0.00000001\n"
+            "1. amount         (numeric, required) The transaction fee in BTC/kB rounded to the nearest 0.00000001\n"
             "\nResult\n"
             "true|false        (boolean) Returns true if successful\n"
             "\nExamples:\n"