package/libfreeglut: fix typo in help text

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libfreeglut/Config.in

@@ -11,7 +11,7 @@ config BR2_PACKAGE_LIBFREEGLUT
 	  OpenGL Utility Toolkit (GLUT) library. GLUT (and hence
 	  FreeGLUT) takes care of all the system-specific chores
 	  required for creating windows, initializing OpenGL contexts,
-	  and handling input events, to allow for trully portable OpenGL
+	  and handling input events, to allow for truly portable OpenGL
 	  programs.
 
 	  http://freeglut.sourceforge.net