codeowners: dev-multicell owns migration guide (#5819)

.github/CODEOWNERS

@@ -3,10 +3,6 @@
 # Anything unmatched by selectors below
 *      @dbt-labs/product-docs
 
-# The blog 
-/website/blog @KiraFuruichi
-
-
 # Adapter & Package Development Docs
 /website/docs/docs/supported-data-platforms.md                @dbt-labs/product-docs @dataders
 /website/docs/reference/warehouse-setups                      @dbt-labs/product-docs @dataders
@@ -17,4 +13,6 @@
 /website/docs/guides/building-packages                          @dbt-labs/product-docs @amychen1776 @dataders @dbeatty10
 /website/docs/guides/creating-new-materializations              @dbt-labs/product-docs @dataders @dbeatty10
 
-
+# Require approval from the Multicell team when making
+# changes to the public facing migration documentation.
+/website/docs/docs/cloud/migration.md @dbt-labs/dev-multicell