Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - fix the release notes title

    It still has Danube in the titile which should be deleted

    Change-Id: Ia5075cf2d713dc9b64e1732b54e99ab604643cee
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 61aafcb..dff85c2 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 61aafcb0ca6cab9c25d2df7d409f4fa8716ebe5f
+Subproject commit dff85c2483e71cd7a4fe1fe48e62b09923bb0ffd