Update git submodules

* Update docs/submodules/bottlenecks from branch 'stable/euphrates'
  - Add project name before UserDevloeper Guide
    otherwise title User Guide without context may be misleading

    Change-Id: I7ae96154633d21dec5ab540e8817ea1c04989cda
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>
    (cherry picked from commit c0ce68364a81e1452b6e28d28b3dbe036b2f24ed)

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 0e74f32..e8246e4 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 0e74f32f9f78fa60ada9c2cb6a9d609e64537a5f
+Subproject commit e8246e4cdea258839af2ccae3fa349650293b2f4