Fixed grammar in comment

examples/CMakeLists.txt

@@ -125,7 +125,7 @@ if (NOT USING_OLD_VISUAL_STUDIO_COMPILER)
    add_gui_example(dnn_mmod_find_cars2_ex)
    add_example(dnn_mmod_train_find_cars_ex)
    if (NOT MSVC)
-      # Don't try to compile this program using Visual Studio since it causes the
+      # Don't try to compile these programs using Visual Studio since it causes the
       # compiler to run out of RAM and to crash.  Maybe someday Visual Studio
       # won't be broken :(
       add_example(dnn_imagenet_train_ex)