docs: driver-api: edid: Fix list formatting

Without the empty lines, Sphinx renders the list as part of the running
text.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/driver-api/edid.rst

@@ -11,11 +11,13 @@ Today, with the advent of Kernel Mode Setting, a graphics board is
 either correctly working because all components follow the standards -
 or the computer is unusable, because the screen remains dark after
 booting or it displays the wrong area. Cases when this happens are:
+
 - The graphics board does not recognize the monitor.
 - The graphics board is unable to detect any EDID data.
 - The graphics board incorrectly forwards EDID data to the driver.
 - The monitor sends no or bogus EDID data.
 - A KVM sends its own EDID data instead of querying the connected monitor.
+
 Adding the kernel parameter "nomodeset" helps in most cases, but causes
 restrictions later on.