Fixed two typos in header file comment.
diff --git a/include/SDL_render.h b/include/SDL_render.h
index 192e502..076363b 100644
--- a/include/SDL_render.h
+++ b/include/SDL_render.h
@@ -552,7 +552,7 @@ extern DECLSPEC void SDLCALL SDL_RenderGetClipRect(SDL_Renderer * renderer,
SDL_Rect * rect);
/**
- * \brief Get wether clipping is enabled on the given renderer
+ * \brief Get whether clipping is enabled on the given renderer.
*
* \param renderer The renderer from which clip state should be queried.
*