add some doc comments

Author: phlptp

include/CLI/Macros.hpp

@@ -125,22 +125,26 @@
 /** rtti enabled */
 #ifndef CLI11_HAS_RTTI
 #if defined(__GXX_RTTI) && __GXX_RTTI == 1
+//gcc
 #define CLI11_HAS_RTTI 1
 #elif defined(_CPPRTTI) && _CPPRTTI == 1
+//msvc
 #define CLI11_HAS_RTTI 1
 #elif defined(__NO_RTTI__) && __NO_RTTI__ == 1
+//intel
 #define CLI11_HAS_RTTI 0
 #elif defined(__has_feature)
+//clang and other newer compilers
 #if __has_feature(cxx_rtti)
 #define CLI11_HAS_RTTI 1
 #else
 #define CLI11_HAS_RTTI 0
 #endif
 #elif defined(__RTTI) || defined(__INTEL_RTTI__)
+// more intel and some other compilers
 #define CLI11_HAS_RTTI 1
 #else
-// we currently assumed it was on so leave it that way
-#define CLI11_HAAS_RTTI 1
+#define CLI11_HAAS_RTTI 0
 #endif
 #endif