Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 613b4a83493160a19999ecae601f158f342dcbab
  - Merge "update logback configuration to remove stack"
  - update logback configuration to remove stack

    Removed stack traces from error logs
    Fixed spelling in error message

    Issue-ID: SO-2670
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I7edc75b2c0b84727fdba3fd6eb893ed7380c613c

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 1e37b70..613b4a8 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 1e37b701d1a2ab4ed41138fdc097f480dfaf305d
+Subproject commit 613b4a83493160a19999ecae601f158f342dcbab