doc: doc updates

doc updates

Signed-off-by: divya pillai <[email protected]>

doc/nrf/releases_and_maturity/known_issues.rst

@@ -3509,6 +3509,15 @@ The issues in this section are related to :ref:`app_dfu`.
 
 .. rst-class:: v2-9-0-nRF54H20 v2-9-0-nRF54H20-rc1
 
+NCSDK-31135: [suit] DFU through the external flash is failing sporadically
+  DFU through the external flash is failing sporadically, although no error is reported.
+
+  **Affected platforms:** nRF54H20
+
+  **Workaround:** Repeat DFU procedure.
+
+.. rst-class:: v2-9-0-nRF54H20 v2-9-0-nRF54H20-rc1
+
 NCSDK-30976: [suit] Update candidate envelope with oversized manifest are not rejected
   An update candidate envelope with a manifest that is too large to fit into its applicable storage slot is still attempted to be installed.
   This results in mismatches between digests for images or dependencies, leading to boot failure.
@@ -3517,7 +3526,7 @@ NCSDK-30976: [suit] Update candidate envelope with oversized manifest are not re
 
 .. rst-class:: v2-9-0 v2-8-0
 
-NCSDK-30161 Combination of :kconfig:option:`CONFIG_ASSERT`, :kconfig:option:`CONFIG_SOC_NRF54H20_GPD`, and external flash causes an assertion during boot time
+NCSDK-30161: Combination of :kconfig:option:`CONFIG_ASSERT`, :kconfig:option:`CONFIG_SOC_NRF54H20_GPD`, and external flash causes an assertion during boot time
   A combination of these three will cause an assert.
   Disabling one of them will fix the issue.