Add slide #16 of upstream training

Change-Id: Ib5e47c81b01089f92074af2d9630022b390e0409

doc/upstream-training/16-reviewing.rst

@@ -0,0 +1,45 @@
+Review unified
+==============
+
+.. image:: ./_assets/16-01-review-unified.png
+
+----
+
+.. image:: ./_assets/16-02-review-unified.png
+  :width: 100%
+
+----
+
+Inline comments
+===============
+
+.. image:: ./_assets/16-03-inline-comments.png
+
+----
+
+Draft inline comments
+=====================
+
+.. image:: ./_assets/16-04-draft-inline-comments.png
+
+----
+
+Regular reviewer
+================
+
+.. image:: ./_assets/16-05-regular-reviewer.png
+
+----
+
+Core reviewer
+=============
+
+.. image:: ./_assets/16-06-core-reviewer.png
+
+----
+
+Exercise
+========
+
+push a wip or draft and invite reviewers
+