Apply suggestions from code review

Author: pcarruscag

SU2_CFD/src/output/CFlowOutput.cpp

@@ -798,11 +798,11 @@ void CFlowOutput::ConvertVariableSymbolsToIndices(const CPrimitiveIndices<unsign
     if (output.otherOutputs.back() == nullptr) {
       if (!allowSkip) {
         SU2_MPI::Error("Invalid history output or solver variable (" + var + ") used in function " + output.name +
-                      "\nValid solvers variables:\n" + knownVariables.str(), CURRENT_FUNCTION);
+                       "\nValid solvers variables:\n" + knownVariables.str(), CURRENT_FUNCTION);
       } else {
         if (rank == MASTER_NODE) {
           std::cout << "Info: Ignoring function " + output.name + " because it may be used by the primal/adjoint "
-                        "solver.\n      If the function is ignored twice it is invalid." << std::endl;
+                       "solver.\n      If the function is ignored twice it is invalid." << std::endl;
         }
         output.skip = true;
         break;

SU2_CFD/src/output/COutput.cpp

@@ -2310,7 +2310,7 @@ void COutput::ComputeSimpleCustomOutputs(const CConfig *config) {
           } else {
             if (rank == MASTER_NODE) {
               std::cout << "Info: Ignoring function " + output.name + " because it may be used by the primal/adjoint "
-                          "solver.\n      If the function is ignored twice it is invalid." << std::endl;
+                           "solver.\n      If the function is ignored twice it is invalid." << std::endl;
             }
             output.skip = true;
             break;

TestCases/species_transport/venturi_primitive_3species/DAspecies3_primitiveVenturi.cfg

@@ -19,7 +19,7 @@ CUSTOM_OUTPUTS= 'avg_species_0 : AreaAvg{SPECIES[0]}[outlet];\
                  var_species : AreaAvg{pow(SPECIES[0] - avg_species_0, 2) +\
                                        pow(SPECIES[1] - avg_species_1, 2)}[outlet]'
 CUSTOM_OBJFUNC= 'var_species'
-OBJECTIVE_FUNCTION= SURFACE_SPECIES_VARIANCE
+OBJECTIVE_FUNCTION= CUSTOM_OBJFUNC
 OBJECTIVE_WEIGHT= 1.0
 %
 % ---------------- INCOMPRESSIBLE FLOW CONDITION DEFINITION -------------------%