[CXX] fix typos reported by the spellchecker CI

src/CXX/Python3/Objects.hxx

@@ -479,7 +479,7 @@ namespace Py
         return Object( Py::_True() );
     }
 
-    // TMM: 31May'01 - Added the #ifndef so I can exlude iostreams.
+    // TMM: 31May'01 - Added the #ifndef so I can exclude iostreams.
 #ifndef CXX_NO_IOSTREAMS
     PYCXX_EXPORT std::ostream &operator<<( std::ostream &os, const Object &ob );
 #endif
@@ -1075,7 +1075,7 @@ namespace Py
 
     // seqref<T> is what you get if you get elements from a non-const SeqBase<T>.
     // Note: seqref<T> could probably be a nested class in SeqBase<T> but that might stress
-    // some compilers needlessly. Simlarly for mapref later.
+    // some compilers needlessly. Similarly for mapref later.
 
     // While this class is not intended for enduser use, it needs some public
     // constructors for the benefit of the STL.
@@ -1403,7 +1403,7 @@ namespace Py
             return SeqBase<T>( PySequence_Concat( ptr(), *other ), true );
         }
 
-        // more STL compatability
+        // more STL compatibility
         const T front() const
         {
             return getItem( 0 );