Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add Clover gambia rtd job"
  - Add Clover gambia rtd job

    - The docs aren't rebuilding for Clover on stable/gambia
    - Assumption here is that this will remedy

    Change-Id: I3310cd1c2edc5418704957bd348d1fd21c4a9dd6
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c8e0cb2..10c59b4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c8e0cb29b08f2515c5e7558bef2fb80cdcb0682b
+Subproject commit 10c59b4c604637031f8bb601a824d8c4d2914fb3