Update git submodules

* Update docs/submodules/holmes/rule-management.git from branch 'master'
  to be6660b777d15cad0ecea69efd9564d4e77564fd
  - Merge "Automation adds release-notes.rst"
  - Automation adds release-notes.rst

    Add _release_notes hook to allow automation.
    Fix non valid release notes characters in content.

    Issue-ID: CIMAN-376
    Change-Id: I0687c709559083fed0dc1f3739d1b46371c6d237
    Signed-off-by: lf-jobbuilder <releng+lf-jobbuilder@linuxfoundation.org>

diff --git a/docs/submodules/holmes/rule-management.git b/docs/submodules/holmes/rule-management.git
index 8463a8f..be6660b 160000 (submodule)
--- a/docs/submodules/holmes/rule-management.git
+++ b/docs/submodules/holmes/rule-management.git
@@ -1 +1 @@
-Subproject commit 8463a8f8e47d90ea614be4a88c2d56bfdb453d1a
+Subproject commit be6660b777d15cad0ecea69efd9564d4e77564fd