Expanded cursor mode descriptions.

include/GLFW/glfw3.h

@@ -1765,9 +1765,12 @@ GLFWAPI int glfwGetInputMode(GLFWwindow* window, int mode);
  *  modes:
  *  - `GLFW_CURSOR_NORMAL` makes the cursor visible and behaving normally.
  *  - `GLFW_CURSOR_HIDDEN` makes the cursor invisible when it is over the client
- *    area of the window.
+ *    area of the window but does not restrict the cursor from leaving.  This is
- *  - `GLFW_CURSOR_DISABLED` disables the cursor and removes any limitations on
+ *    useful if you wish to render your own cursor or have no visible cursor at
- *    cursor movement.
+ *    all.
+ *  - `GLFW_CURSOR_DISABLED` hides and grabs the cursor, providing virtual
+ *    and unlimited cursor movement.  This is useful for implementing for
+ *    example 3D camera controls.
  *
  *  If `mode` is `GLFW_STICKY_KEYS`, the value must be either `GL_TRUE` to
  *  enable sticky keys, or `GL_FALSE` to disable it.  If sticky keys are