docs: release: Add release notes

Adds release notes for various recent changes

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
diff --git a/docs/release-notes.d/boot-serial-echo.md b/docs/release-notes.d/boot-serial-echo.md
index 2667f73..6116f05 100644
--- a/docs/release-notes.d/boot-serial-echo.md
+++ b/docs/release-notes.d/boot-serial-echo.md
@@ -1 +1,4 @@
-- Boot serial: Add response to echo command if support is not enabled, previously the command would have been accepted but no response indicating that the command is not supported would have been sent.
+- Boot serial: Add response to echo command if support is not
+  enabled, previously the command would have been accepted but no
+  response indicating that the command is not supported would have
+  been sent.
diff --git a/docs/release-notes.d/zephyr-encryption-single.md b/docs/release-notes.d/zephyr-encryption-single.md
new file mode 100644
index 0000000..78767db
--- /dev/null
+++ b/docs/release-notes.d/zephyr-encryption-single.md
@@ -0,0 +1,3 @@
+- Zephyr: Fix issue with single application slot mode, serial
+  recovery and encryption whereby an encrypted image is loaded
+  and being wrongly treated as encrypted after decryption.
diff --git a/docs/release-notes.d/zephyr-estimated-sysbuild.mc b/docs/release-notes.d/zephyr-estimated-sysbuild.mc
new file mode 100644
index 0000000..8b42c26
--- /dev/null
+++ b/docs/release-notes.d/zephyr-estimated-sysbuild.mc
@@ -0,0 +1 @@
+- Zephyr: Add estimated image footer size to cache in sysbuild.
diff --git a/docs/release-notes.d/zephyr-mass-erase.md b/docs/release-notes.d/zephyr-mass-erase.md
new file mode 100644
index 0000000..7834ee2
--- /dev/null
+++ b/docs/release-notes.d/zephyr-mass-erase.md
@@ -0,0 +1 @@
+- Zephyr: Remove deprecated ZEPHYR_TRY_MASS_ERASE Kconfig option.
diff --git a/docs/release-notes.d/zephyr-mbedtls-kconfig.md b/docs/release-notes.d/zephyr-mbedtls-kconfig.md
new file mode 100644
index 0000000..d7914cb
--- /dev/null
+++ b/docs/release-notes.d/zephyr-mbedtls-kconfig.md
@@ -0,0 +1 @@
+- Zephyr: Prevent MBEDTLS Kconfig selection when tinycrypt is used.
diff --git a/docs/release-notes.d/zephyr-usb.md b/docs/release-notes.d/zephyr-usb.md
index 7154f58..139de7c 100644
--- a/docs/release-notes.d/zephyr-usb.md
+++ b/docs/release-notes.d/zephyr-usb.md
@@ -1,2 +1,7 @@
-- Zephyr: Add USB CDC serial recovery check that now causes a build failure if console is enabled and device is the same as the USB CDC device.
-- Zephyr: Add USB CDC serial recovery check that now causes a build failure if the main thread priority is below 0 (cooperative thread), this would prevent USB CDC from working as the driver would not have been able to fire callbacks.
+- Zephyr: Add USB CDC serial recovery check that now causes a build
+  failure if console is enabled and device is the same as the USB
+  CDC device.
+- Zephyr: Add USB CDC serial recovery check that now causes a build
+  failure if the main thread priority is below 0 (cooperative
+  thread), this would prevent USB CDC from working as the driver
+  would not have been able to fire callbacks.