Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to 21d5e7be75d5e8aa4abfe269bea89edec38c75c1
  - Merge "[DOC] Add a link to release note"
  - [DOC] Add a link to release note
    
    New documentation generation system relies on disjoint documentations.
    This patch adds an label for OOM release note with name being consistent
    accross all ONAP components.
    
    Issue-ID: CIMAN-33
    Change-Id: I5e5fbe5d5038056a7a684828c9e02f082bfa7f0b
    Signed-off-by: lf-jobbuilder <releng+lf-jobbuilder@linuxfoundation.org>
    Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
    
diff --git a/docs/submodules/oom.git b/docs/submodules/oom.git
index 23756ac..21d5e7b 160000
--- a/docs/submodules/oom.git
+++ b/docs/submodules/oom.git
@@ -1 +1 @@
-Subproject commit 23756ac9a30c9dd391c6cb8a7bfa44fc780fa0c4
+Subproject commit 21d5e7be75d5e8aa4abfe269bea89edec38c75c1