Coding style for inner namespaces is should be simplified to not indented

Coding style for inner namespaces is should be simplified to not indented
https://bugs.webkit.org/show_bug.cgi?id=232073

Patch by Kimmo Kinnunen <kkinnunen@apple.com> on 2021-11-10
Reviewed by Antti Koivisto.

.:

* .clang-format:
Do not indent contents of inner namespaces, match current code.

Websites/webkit.org:

* code-style.md:
Simplify coding style to match the existing code: contents of inner namespaces
should not be indented.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@285601 268f45cc-cd09-0410-ab3c-d52691b4dbfc