Update git submodules

* Update docs/submodules/dovetail from branch 'stable/fraser'
  - Update release note and user guide before tagging ovp-2.2.0

    Change-Id: I1b1a1c96db933dc54242a226a6b8ea4a58147a14
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 346e28b..da70a65 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 346e28bf54f17354a7f784f57d3d52b9b91f22cd
+Subproject commit da70a659965038ab4af8f1050b11b310579e786f