Fix docs for Windows monitor size calculation

This sentence was truncated by 951a9583faf91bdbe96bacd5d24a8969c0cca418
and then not updated when content scale support was added with
16bf872117896fb88493403157fcd367303fd1f6.

(cherry picked from commit 6a200531026f383d7f5c260ae802c43be80c2cd7)

include/GLFW/glfw3.h

@@ -2125,8 +2125,8 @@ GLFWAPI void glfwGetMonitorWorkarea(GLFWmonitor* monitor, int* xpos, int* ypos,
  *
  *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
  *
- *  @remark @win32 calculates the returned physical size from the
- *  current resolution and system DPI instead of querying the monitor EDID data.
+ *  @remark @win32 On Windows 8 and earlier the physical size is calculated from
+ *  the current resolution and system DPI instead of querying the monitor EDID data.
  *
  *  @thread_safety This function must only be called from the main thread.
  *