Bump the trunk major version to 16

GitOrigin-RevId: 809855b56f06dd7182685f88fbbc64111df9339a
diff --git a/docs/conf.py b/docs/conf.py
index 21f1b01..3fe17d0 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -48,9 +48,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '15.0'
+version = '16.0'
 # The full version, including alpha/beta/rc tags.
-release = '15.0'
+release = '16.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.