Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fix URL anchor in apex document."
  - Fix URL anchor in apex document.

    The latest OPNFV document template makes html file separately,
    hence index.html#<something> is invalid. This fix changes anchor
    URL to support separate file.

    Change-Id: Ic48c062e118d2faede53e8c9eaecbb99e58fddfb
    Signed-off-by: Tomofumi Hayashi <tohayash@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index b2905df..8a60d33 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit b2905df3252698437d66fb8ff368d1ef28230e63
+Subproject commit 8a60d332f17967dfa861e1e8644d16eb3eab2346