Update git submodules

* Update docs/submodules/snaps from branch 'stable/fraser'
  - Fix to a router's internal subnet resoulution.

    Ensures that any subnet added to the router is available to that project.

    Change-Id: Iddfad14a093551bc0f4a05c52b20f02db2474d78
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 429b829..ffafa2f 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 429b829fe4a745cdffd6c804a2a5e71d83cfbe0b
+Subproject commit ffafa2f92bc0806a5b274deca3c7fad59ee8d769