[roll] Roll fuchsia [.clang-format] Update namespace formatting settings

Always put blank lines around namespaces and always add/fix end
comments on namespaces (except ones categorized as "short").

Also break up the .clang-format file with blank lines for
readability, and group related options together.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1191616
Original-Revision: 4855844d4c9cac83556895dc9dd034ba8a0809fa
GitOrigin-RevId: 07562a50edab6069dae51e024102bc232d01d20c
Change-Id: Ifdbd6d8179b6a81a1c14fdc3cc9c4eb1a8fce8f1
diff --git a/stem b/stem
index fc2ab54..73a5b12 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="c2365799a3793e002717333b9e98f450f190856f"/>
+             revision="4855844d4c9cac83556895dc9dd034ba8a0809fa"/>
   </projects>
   <hooks>
     <hook name="install-environment"