[Driver] Update the comment about incompatible sanitizers

clang/lib/Driver/SanitizerArgs.cpp

std::pair<SanitizerMask, SanitizerMask> IncompatibleGroups[] = {
       std::make_pair(Scudo, Address | HWAddress | Leak | Thread | Memory |
                                 KernelAddress | Efficiency),
       std::make_pair(SafeStack, Address | HWAddress | Leak | Thread | Memory |
                                     KernelAddress | Efficiency)};
 
   // Enable toolchain specific default sanitizers if not explicitly disabled.
   SanitizerMask Default = TC.getDefaultSanitizers() & ~AllRemove;
 
-  // Disable default sanitizers that are incompatible with the default ones.
+  // Disable default sanitizers that are incompatible with explicitly requested
+  // ones.
   for (auto G : IncompatibleGroups) {
     SanitizerMask Group = G.first;
     if ((Default & Group) && (Kinds & G.second))
       Default &= ~Group;
   }
 
   Kinds |= Default;