3.38 release notes (#12621)

Co-authored-by: Parker Lougheed <parlough@gmail.com>
Co-authored-by: Shams Zakhour <44418985+sfshaza2@users.noreply.github.com>

Author: 3 people

src/content/release/release-notes/index.md

@@ -12,9 +12,8 @@ For information about bug-fix releases,
 check out the Flutter [CHANGELOG][].
 :::
 
-* 3.38.0 _(Tentative)_
-  {% comment %} * [3.38.0 announcement][] {% endcomment %}
-  {% comment %} * [3.38.0 release notes & change log][] {% endcomment %}
+* 3.38.0
+  * [3.38.0 release notes & change log][]
   * [3.38.0 breaking changes & migrations][]
 * 3.35.0
   * [3.35.0 announcement][]
@@ -105,6 +104,7 @@ check out the Flutter [CHANGELOG][].
 * Earlier
   * [Archived release notes][]
 
+[3.38.0 release notes & change log]: /release/release-notes/release-notes-3.38.0
 [3.38.0 breaking changes & migrations]: /release/breaking-changes#released-in-flutter-3-38
 [3.35.0 announcement]: {{site.flutter-blog}}/whats-new-in-flutter-3-35-c58ef72e3766
 [3.35.0 release notes & change log]: /release/release-notes/release-notes-3.35.0