Update git submodules

* Update docs/submodules/clover from branch 'stable/fraser'
  - Updated user guide with edits and reference links

    - Provided some overall edits to user guide
    - Fixed titles of index files for release notes and user guide
    - Added links to SDC, A-B configuration guides and logging, tracing
    and monitoring install/validation docs

    Change-Id: I9a0e1e0a2c12b20400eec5a5642f7c5de2dbd7bf
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index f7e4ee9..21d50ab 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit f7e4ee9d188a52282cec6fd62ea246992ebff2f0
+Subproject commit 21d50ab93ea47451309fd3bad1e4f66c0adce829