Merge #18502: doc: Update docs for getbalance (default minconf should be 0)

c0af173da2 doc: default minconf for getbalance should be 0 (U-Zyn Chua)

Pull request description:

  - Default `minconf` for `getbalance` is `0` but example in doc was showing as `1`.
  - `at least 6 blocks confirmed` now updated to be `at least 6 confirmations` to be more consistent with the terminology used elsewhere in the codebase and documentations.

ACKs for top commit:
  theStack:
    re-ACK c0af173da2

Tree-SHA512: 8f67af78a222a4bd2957658b37fae2224783274f355af84f39a5ce0da90b21f03dc798a6408d44a724c353ff5ed7dfec943fb28726ec423028b64fc579f937ad

src/wallet/rpcwallet.cpp

@@ -732,9 +732,9 @@ static UniValue getbalance(const JSONRPCRequest& request)
                     RPCResult::Type::STR_AMOUNT, "amount", "The total amount in " + CURRENCY_UNIT + " received for this wallet."
                 },
                 RPCExamples{
-            "\nThe total amount in the wallet with 1 or more confirmations\n"
+            "\nThe total amount in the wallet with 0 or more confirmations\n"
             + HelpExampleCli("getbalance", "") +
-            "\nThe total amount in the wallet at least 6 blocks confirmed\n"
+            "\nThe total amount in the wallet with at least 6 confirmations\n"
             + HelpExampleCli("getbalance", "\"*\" 6") +
             "\nAs a JSON-RPC call\n"
             + HelpExampleRpc("getbalance", "\"*\", 6")