[llvm] [Github] Fix comment formatting for code format action (PR #75764)

[David Spickett via llvm-commits]

DavidSpickett wrote:

I fixed it another way with https://github.com/llvm/llvm-project/commit/428660cfb986dd0a59cd2a16972c5f7109080522, but your change also removes an extra newline so that's nice improvement.

(the newline was unrelated to the problem)

https://github.com/llvm/llvm-project/pull/75764