Update git submodules

* Update docs/submodules/auto from branch 'master'
  - Merge "docs: Index for local doc build"
  - docs: Index for local doc build

    A toplevel index was added to support local doc build. Nested indexes
    were modified to correctly apply chapter numbering, i.e. toctree
    numbering should be enabled on toplevel index only.

    Change-Id: Ifb5682da2fcd06f4bb491e5846d239ca6517155f
    Signed-off-by: Martin Klozik <martin.klozik@tieto.com>

diff --git a/docs/submodules/auto b/docs/submodules/auto
index 7c6ea04..80c523a 160000 (submodule)
--- a/docs/submodules/auto
+++ b/docs/submodules/auto
@@ -1 +1 @@
-Subproject commit 7c6ea0480fd92e648e8bf5e15ee70370ec5332c3
+Subproject commit 80c523a18d8b694f4002dea7c9c7101317941978