fixed uppercase

manual/graphics/tutorials/index.md

@@ -4,7 +4,7 @@ This section contains a set of tutorials related to graphics.
 
 * [How to render object outline](render-object-outline.md)
 * [How to render FPS weapon](render-fps-weapon.md)
-* [How to Use anisotropic texture sampler](anisotropic-texture-sampler.md)
+* [How to use anisotropic texture sampler](anisotropic-texture-sampler.md)
 * [How to use dynamic texture](use-dynamic-texture.md)
 * [How to setup time of the day simulation](time-of-the-day.md)
 * [How to draw custom set of actors or scenes](custom-actors-scenes-drawing.md)