update release notes

docs/release_notes/version_1_7.rst

@@ -6,7 +6,8 @@
 * Add `pegasus.elbowplot <./api/pegasus.elbowplot.html>`_ function to generate elbowplot, with an automated suggestion on number of PCs to be selected based on random matrix theory (`[Johnstone 2001] <https://projecteuclid.org/journals/annals-of-statistics/volume-29/issue-2/On-the-distribution-of-the-largest-eigenvalue-in-principal/10.1214/aos/1009210544.full>`_ and `[Shekhar 2022] <https://elifesciences.org/articles/73809>`_).
 * Add `arcsinh_transform <./api/pegasus.arcsinh_transform.html>`_ function for arcsinh transformation on the count matrix.
 
-**API Changes**
+**Improvement**
 
 * Function ``nearest_neighbors`` has additional argument ``n_comps`` to allow use part of the components from the source embedding for calculating the nearest neighbor graph.
 * Add ``n_comps`` argument for ``run_harmony``, ``tsne``, ``umap``, and ``fle`` (argument name is ``rep_ncomps``) functions to allow select part of the components from the source embedding.
+* Function ``scatter`` can plot multiple components and bases.