[clang-tools-extra] [clang-tidy] Clarify diagnostics of bugprone-sizeof-expression (PR #95550)

[via cfe-commits]

whisperity wrote:

Maybe the use of the `:` is indeed problematic, even if that would be the most accurate use of English in the present form, because of its use in the normal text-diagnostic-printing output. (Speaking from the English side of things, a `-` would also be incorrect, you would need a dash (`–`) but then that would not be nice on ASCII and whatnot...)

https://github.com/llvm/llvm-project/pull/95550