Fix typo in GLFWwindowmaximizefun documentation

Thanks brianzuvich!

Fixes #1764.

include/GLFW/glfw3.h

@@ -1483,7 +1483,7 @@ typedef void (* GLFWwindowiconifyfun)(GLFWwindow*,int);
  *  @endcode
  *
  *  @param[in] window The window that was maximized or restored.
- *  @param[in] iconified `GLFW_TRUE` if the window was maximized, or
+ *  @param[in] maximized `GLFW_TRUE` if the window was maximized, or
  *  `GLFW_FALSE` if it was restored.
  *
  *  @sa @ref window_maximize