remove migrations changes

docs/build/building-modules/18-decimal-handling.md

@@ -15,14 +15,14 @@ These changes require a state migration to update existing decimal values to the
 ## Why the Change?
 
 * **Enhanced Precision**: `Dec` uses the [apd](https://github.com/cockroachdb/apd) library for arbitrary precision decimals, suitable for accurate financial calculations.
-* **Immutable Operations**: `Dec` operations are safer for concurrent use as they do not mutate the original values.
+* **Immutable Operations**: `Dec` operations are safer for concurrent use, as they do not mutate the original values.
 * **Better Performance**: `Dec` operations are faster and more efficient than `LegacyDec`.`
 
 ## Using `Dec` in Modules that haven't used `LegacyDec`
 
 If you are creating a new module or updating an existing module that has not used `LegacyDec`, you can directly use `Dec` without any changes.
 
-As an example we will use `DecCoin` which is a common type used in the Cosmos SDK.
+As an example, we will use `DecCoin` which is a common type used in the Cosmos SDK.
 
 
 ```protobuf

testutil/collections_test.go

@@ -14,6 +14,7 @@ func TestDiffCollectionsMigration(t *testing.T) {
 	key := storetypes.NewKVStoreKey("test")
 	ctx := testutil.DefaultContext(key, storetypes.NewTransientStoreKey("transient"))
 
+	// First try with some invalid hash
 	err := testutil.DiffCollectionsMigration(
 		ctx,
 		key,
@@ -25,7 +26,7 @@ func TestDiffCollectionsMigration(t *testing.T) {
 	)
 	require.Error(t, err)
 
-
+	// Now reset and try with the correct hash
 	ctx = testutil.DefaultContext(key, storetypes.NewTransientStoreKey("transient"))
 	err = testutil.DiffCollectionsMigration(
 		ctx,