Update git submodules

* Update docs/submodules/ipv6 from branch 'stable/fraser'
  - Fix bullet style in Release Notes

    Change-Id: I7763e67a1df251abca78e04411f15ea790600bea
    Signed-off-by: Bin Hu <bh526r@att.com>
    (cherry picked from commit a1f0778b5aa40e2d179d00b941853749b58ab6a7)

diff --git a/docs/submodules/ipv6 b/docs/submodules/ipv6
index 8d92071..5b91469 160000 (submodule)
--- a/docs/submodules/ipv6
+++ b/docs/submodules/ipv6
@@ -1 +1 @@
-Subproject commit 8d92071b644ac9e45208feca41b6d45f008ec9a0
+Subproject commit 5b914695088b39aee3886bd60be4707b7a11a1e8