[Polly][docs] Fix itemize list for release notes.

Make the changes top-level items, instead of subitems of the
"Changes..." placeholder.

GitOrigin-RevId: a5e52ce3f2aaa348064c08c13c9bdf3936d75a28
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 3d550e2..15b108c 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -10,16 +10,14 @@
   the new features that have recently been committed to our development
   branch.
 
-- Change ...
-
- * The command line option -polly-opt-fusion has been removed. What the
-   flag does was frequently misunderstood and is rarely useful. However,
-   the functionality is still accessible using
+- The command line option -polly-opt-fusion has been removed. What the
+  flag does was frequently misunderstood and is rarely useful. However,
+  the functionality is still accessible using
 ```
     -polly-isl-arg=--no-schedule-serialize-sccs
 ```
 
- * The command line option -polly-loopfusion-greedy has been added.
-   This will agressively try to fuse any loop regardless of
-   profitability. The is what users might have expected what
-   -polly-opt-fusion=max would do.
+- The command line option -polly-loopfusion-greedy has been added.
+  This will agressively try to fuse any loop regardless of
+  profitability. The is what users might have expected what
+  -polly-opt-fusion=max would do.