[libc] Fix typo of namespace in round implementation.

Summary: Fixed typos in namespace declarations and comments in the files under `src/math/round`.

Reviewers: sivachandra, abrachet

Reviewed By: sivachandra, abrachet

Subscribers: MaskRay, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D75205

GitOrigin-RevId: 52073310e443a206653f8f4c841f42ed88ab549b
3 files changed