Updates hydra: 688b30e Fix: docs: M.2

diff --git a/hydra b/hydra
index 8b6eb8bd5b9b5fc7e108173e9ba39006e288a035..688b30e3935b642ed5c8e3a910964e882a8d4c9d 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 8b6eb8bd5b9b5fc7e108173e9ba39006e288a035
+Subproject commit 688b30e3935b642ed5c8e3a910964e882a8d4c9d