doc: release-notes-3.6: remove section for disk drivers

No changes have been made to disk drivers since 3.5, so remove the
section for this release.

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

doc/releases/release-notes-3.6.rst

@@ -334,8 +334,6 @@ Drivers and Sensors
 
 * DAC
 
-* Disk
-
 * Display
 
   * Introduce frame buffer config to STM32 LTDC driver.