[clang] [clang-format] Add --strip-trailing-cr to diff in docs_updated.test (PR #119666)

[Owen Pan via cfe-commits]

owenca wrote:

> Is the cleanup just running `black`? Would be better committed separately in my opinion.

See ea44647a0b49de826191eeb6e05020262b5a81e9.

https://github.com/llvm/llvm-project/pull/119666