doc: loadwallet loads from relative walletdir

Improves the documentation of help output for loadwallet
to clarify that filename is relative to the default
wallet directory. Adds examples that get a wallet from
sub-directories.

Author: am-sq

src/wallet/rpc/wallet.cpp

@@ -220,7 +220,7 @@ static RPCHelpMan loadwallet()
                 "\nNote that all wallet command-line options used when starting bitcoind will be"
                 "\napplied to the new wallet.\n",
                 {
-                    {"filename", RPCArg::Type::STR, RPCArg::Optional::NO, "The wallet directory or .dat file."},
+                    {"filename", RPCArg::Type::STR, RPCArg::Optional::NO, "The path to the directory of the wallet to be loaded, either absolute or relative to the \"wallets\" directory. The \"wallets\" directory is set by the -walletdir option and defaults to the \"wallets\" folder within the data directory."},
                     {"load_on_startup", RPCArg::Type::BOOL, RPCArg::Optional::OMITTED, "Save wallet name to persistent settings and load on startup. True to add wallet to startup list, false to remove, null to leave unchanged."},
                 },
                 RPCResult{
@@ -234,8 +234,15 @@ static RPCHelpMan loadwallet()
                     }
                 },
                 RPCExamples{
-                    HelpExampleCli("loadwallet", "\"test.dat\"")
-            + HelpExampleRpc("loadwallet", "\"test.dat\"")
+                    "\nLoad wallet from the wallet dir:\n"
+                    + HelpExampleCli("loadwallet", "\"walletname\"")
+                    + HelpExampleRpc("loadwallet", "\"walletname\"")
+                    + "\nLoad wallet using absolute path (Unix):\n"
+                    + HelpExampleCli("loadwallet", "\"/path/to/walletname/\"")
+                    + HelpExampleRpc("loadwallet", "\"/path/to/walletname/\"")
+                    + "\nLoad wallet using absolute path (Windows):\n"
+                    + HelpExampleCli("loadwallet", "\"DriveLetter:\\path\\to\\walletname\\\"")
+                    + HelpExampleRpc("loadwallet", "\"DriveLetter:\\path\\to\\walletname\\\"")
                 },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {