migration notes fix

docs/docs/migration_notes.md

@@ -6,6 +6,31 @@ keywords: [sandbox, aztec, notes, migration, updating, upgrading]
 
 Aztec is in full-speed development. Literally every version breaks compatibility with the previous ones. This page attempts to target errors and difficulties you might encounter when upgrading, and how to resolve them.
 
+## TBD
+
+### [Aztec.nr] Introduction of `Packable` trait
+We have introduced a `Packable` trait that allows types to be serialized and deserialized with a focus on minimizing the size of the resulting Field array.
+This is in contrast to the `Serialize` and `Deserialize` traits, which follows Noir's intrinsic serialization format.
+This is a breaking change because we now require `Packable` trait implementation for any type that is to be stored in contract storage.
+
+Example implementation of Packable trait for `U128` type from `noir::std`:
+
+```
+use crate::traits::{Packable, ToField};
+
+let U128_PACKED_LEN: u32 = 1;
+
+impl Packable<U128_PACKED_LEN> for U128 {
+    fn pack(self) -> [Field; U128_PACKED_LEN] {
+        [self.to_field()]
+    }
+
+    fn unpack(fields: [Field; U128_PACKED_LEN]) -> Self {
+        U128::from_integer(fields[0])
+    }
+}
+```
+
 ## 0.72.0
 ### Public logs replace unencrypted logs
 Any log emitted from public is now known as a public log, rather than an unencrypted log. This means methods relating to these logs have been renamed e.g. in the pxe, archiver, txe:
@@ -41,29 +66,6 @@ This PR also renamed encrypted events to private events:
 ### [Aztec.nr] Removal of `getSiblingPath` oracle
 Use `getMembershipWitness` oracle instead that returns both the sibling path and index.
 
-### [Aztec.nr] Introduction of `Packable` trait
-We have introduced a `Packable` trait that allows types to be serialized and deserialized with a focus on minimizing the size of the resulting Field array.
-This is in contrast to the `Serialize` and `Deserialize` traits, which follows Noir's intrinsic serialization format.
-This is a breaking change because we now require `Packable` trait implementation for any type that is to be stored in contract storage.
-
-Example implementation of Packable trait for `U128` type from `noir::std`:
-
-```
-use crate::traits::{Packable, ToField};
-
-let U128_PACKED_LEN: u32 = 1;
-
-impl Packable<U128_PACKED_LEN> for U128 {
-    fn pack(self) -> [Field; U128_PACKED_LEN] {
-        [self.to_field()]
-    }
-
-    fn unpack(fields: [Field; U128_PACKED_LEN]) -> Self {
-        U128::from_integer(fields[0])
-    }
-}
-```
-
 ## 0.68.0
 ### [archiver, node, pxe] Remove contract artifacts in node and archiver and store function names instead
 Contract artifacts were only in the archiver for debugging purposes. Instead function names are now (optionally) emitted