update samples: waitKey() usage

Original commit is a5f19f7dd6ae5bc93f73e0417a9e0bfd34c01672

doc/tutorials/imgproc/imgtrans/remap/remap.markdown

@@ -85,9 +85,9 @@ Explanation
     while( true )
     {
       /// Each 1 sec. Press ESC to exit the program
-      int c = waitKey( 1000 );
+      char c = (char)waitKey( 1000 );
 
-      if( (char)c == 27 )
+      if( c == 27 )
         { break; }
 
       /// Update map_x & map_y. Then apply remap

doc/tutorials/imgproc/pyramids/pyramids.markdown

@@ -93,6 +93,7 @@ Let's check the general structure of the program:
 
 -   Perform an infinite loop waiting for user input.
     @snippet cpp/tutorial_code/ImgProc/Pyramids.cpp infinite_loop
+
     Our program exits if the user presses *ESC*. Besides, it has two options:
 
     -   **Perform upsampling (after pressing 'u')**