Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Yardstick Fraser Release notes - 6.2.0"
  - Yardstick Fraser Release notes - 6.2.0

    JIRA: YARDSTICK-1261

    Change-Id: I61adeaea8a727605481ffce9dae9646f160bf401
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 005358a..2e5bdb7 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 005358a39a87e42061dd5b344916c2ffe0475961
+Subproject commit 2e5bdb770ca4f5f5e06c79b4e97f3a22bac8e960