doc: add release note for changes to go/types/SizesFor

For #61035.

Change-Id: I27e2c44f9275b508d9dccc50da80896384a4c8fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/546837
TryBot-Bypass: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>

doc/go1.22.html

@@ -516,8 +516,11 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
       TODO: <a href="https://go.dev/issue/63223">https://go.dev/issue/63223</a>: API changes to support explicit Alias nodes
     </p>
 
-    <p><!-- https://go.dev/issue/61035 -->
-      TODO: <a href="https://go.dev/issue/61035">https://go.dev/issue/61035</a>: go/types, types2: fix SizesFor(&#34;gc&#34;, ...) to match actual gc behavior
+    <p><!-- https://go.dev/issue/61035, multiple CLs, see issue for details -->
+      The implementation of <a href="/pkg/go/types#SizesFor"><code>SizesFor</code></a> has been adjusted to compute
+      the same type sizes as the compiler when the compiler argument for <code>SizesFor</code> is <code>"gc"</code>.
+      The default <a href="/pkg/go/types#Sizes"><code>Sizes</code></a> implementation used by the type checker is now
+      <code>types.SizesFor("gc", "amd64")</code>.
     </p>
 
     <p><!-- CL 541575 -->