[Sync EN] sigmoidalcontrastimage.xml Amend parameter names (#5751)

[github-actions]

Commit: https://github.com/php/doc-en/commit/d9fec5dc8a61c5bbee1d7f70a7bea50c2388e0fd
PR: https://github.com/php/doc-en/pull/5751

Archivos ES a actualizar

• reference/imagick/imagick/sigmoidalcontrastimage.xml