doc: Update redirects.py to find the correct README

1. Update redirects.py to find the correct mimxrt595_evk
system_off example README.
2. Update release-notes to record the new nxp poweroff
example.

Signed-off-by: Zhaoxiang Jin <[email protected]>

Author: ZhaoxiangJin

doc/_scripts/redirects.py

@@ -253,7 +253,7 @@
     ('samples/boards/mec15xxevb_assy6853/power_management/README', 'samples/boards/microchip/mec15xxevb_assy6853/power_management/README'),
     ('samples/boards/mimxrt1060_evk/system_off/README', 'samples/boards/nxp/mimxrt1060_evk/system_off/README'),
     ('samples/boards/mimxrt1170_evk_cm7/magic_addr/README', 'samples/boards/nxp/mimxrt1170_evk_cm7/magic_addr/README'),
-    ('samples/boards/mimxrt595_evk/system_off/README', 'samples/boards/nxp/mimxrt595_evk/system_off/README'),
+    ('samples/boards/mimxrt595_evk/system_off/README', 'samples/boards/nxp/poweroff/README'),
     ('samples/boards/nrf/battery/README', 'samples/boards/nordic/battery/README'),
     ('samples/boards/nrf/clock_skew/README', 'samples/boards/nordic/clock_skew/README'),
     ('samples/boards/nrf/dynamic_pinctrl/README', 'samples/boards/nordic/dynamic_pinctrl/README'),

doc/releases/release-notes-4.3.rst

@@ -148,6 +148,8 @@ New Drivers
 New Samples
 ***********
 
+* :zephyr:code-sample:`nxp_mcu_poweroff`
+
 ..
   Same as above for boards and drivers, this will also be recomputed at the time of the release.
  Just link the sample, further details go in the sample documentation itself.