rpc: doc: remove redundant "descriptors" parameter in createwallet examples

This is the RPC example counterpart to commit
86de8c1 (PR #32544).
Since the recent legacy wallet removal this parameter *must* be
true, so providing it in the examples doesn't contain valuable
information anymore and it seems best to remove them.

Author: theStack

src/wallet/rpc/wallet.cpp

@@ -351,8 +351,8 @@ static RPCHelpMan createwallet()
         RPCExamples{
             HelpExampleCli("createwallet", "\"testwallet\"")
             + HelpExampleRpc("createwallet", "\"testwallet\"")
-            + HelpExampleCliNamed("createwallet", {{"wallet_name", "descriptors"}, {"avoid_reuse", true}, {"descriptors", true}, {"load_on_startup", true}})
-            + HelpExampleRpcNamed("createwallet", {{"wallet_name", "descriptors"}, {"avoid_reuse", true}, {"descriptors", true}, {"load_on_startup", true}})
+            + HelpExampleCliNamed("createwallet", {{"wallet_name", "descriptors"}, {"avoid_reuse", true}, {"load_on_startup", true}})
+            + HelpExampleRpcNamed("createwallet", {{"wallet_name", "descriptors"}, {"avoid_reuse", true}, {"load_on_startup", true}})
         },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {