Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Change the function imposed on instances/tasks

    The number of instances/tasks should be cumulated instead of
    averaging.

    Change-Id: If63244ea086de8ba6a74865e5bad23feec01b3d6
    Signed-off-by: Yang (Gabriel) Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index c8cde09..f6ca90e 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit c8cde0912247d1c9f8a68b034cf7e213ebfeea0b
+Subproject commit f6ca90e950a3b007b118cad702616267fab91916