Nit updates

Author: alinaliBQ

cpp/src/arrow/flight/sql/odbc/odbc_api.cc

@@ -884,7 +884,8 @@ SQLRETURN SQLMoreResults(SQLHSTMT stmt) {
   ARROW_LOG(DEBUG) << "SQLMoreResults called with stmt: " << stmt;
 
   using ODBC::ODBCStatement;
-  // Multiple result sets not supported. Return SQL_NO_DATA by default.
+  // Multiple result sets are not supported by Arrow protocol. Return SQL_NO_DATA by
+  // default to indicate no data is available.
   return ODBCStatement::ExecuteWithDiagnostics(stmt, SQL_ERROR, [=]() {
     ODBCStatement* statement = reinterpret_cast<ODBCStatement*>(stmt);
     return statement->GetMoreResults();

cpp/src/arrow/flight/sql/odbc/odbc_impl/odbc_statement.cc

@@ -736,7 +736,7 @@ bool ODBCStatement::GetData(SQLSMALLINT record_number, SQLSMALLINT c_type,
 }
 
 SQLRETURN ODBCStatement::GetMoreResults() {
-  // Multiple result sets are not supported.
+  // Multiple result sets are not supported by Arrow protocol.
   if (current_result_) {
     return SQL_NO_DATA;
   } else {

cpp/src/arrow/flight/sql/odbc/tests/statement_test.cc

@@ -38,8 +38,7 @@ using TestTypes = ::testing::Types<StatementMockTest, StatementRemoteTest>;
 TYPED_TEST_SUITE(StatementTest, TestTypes);
 
 TYPED_TEST(StatementTest, TestSQLMoreResultsNoData) {
-  // Verify SQLMoreResults is stubbed to return SQL_NO_DATA
-
+  // Verify SQLMoreResults returns SQL_NO_DATA by default.
   std::wstring wsql = L"SELECT 1;";
   std::vector<SQLWCHAR> sql0(wsql.begin(), wsql.end());