Tools: [skip ci] Adjust comment about the creation of a bitmap handle

src/Tools/thumbs/ThumbnailProvider/ThumbnailProvider.cpp

@@ -259,7 +259,7 @@ STDMETHODIMP CThumbnailProvider::GetThumbnail(UINT cx,
                 content.push_back(c);
             }
 
-            // pass the memory buffer to CxImage library to create the bitmap handle
+            // pass the memory buffer to an IStream to create the bitmap handle
             IStream* stream = CreateStreamOnResource(&(content[0]), content.size());
             if (stream) {
                 IWICBitmapSource* bmpSrc = LoadBitmapFromStream(stream);