STYLE: Remove empty line from doc file (pre-commit "fix end of files")

Locally ran pixi at the root of ITK source tree, as follows:

    ./.git/hooks/pixi/bin/pixi.exe run pre-commit-run

Output:

    Pixi task (pre-commit-run in pre-commit): pre-commit run --all: (Run pre-commit hooks on all repository files)
    check for added large files..............................................Passed
    [...]
    fix end of files.........................................................Failed
    - hook id: end-of-file-fixer
    - exit code: 1
    - files were modified by this hook

Author: N-Dekker

Documentation/docs/releases/5.4.2.md

@@ -272,4 +272,3 @@ Remote Module Changes Since v5.4.0
 #### Bug Fixes
 
 - Bump Python package version for re-deploy ([9f6654d](https://github.com/InsightSoftwareConsortium/ITKTotalVariation/commit/9f6654d))
-