[clang] [clang-format] Add BraceWrapping.AfterExportBlock option (PR #216892)

[Björn Schäpers via cfe-commits]

https://github.com/HazardyKnusperkeks commented:

Please add the config parse test.
And you need to regenerate the documentation.

https://github.com/llvm/llvm-project/pull/216892