Add Soboleva Modified Hyberbolic Tangent function (#10043)

* Add Sobovela Modified Hyberbolic Tangent function

* fix: typo

* Update and rename sobovela_modified_hyperbolic_tangent.py to soboleva_modified_hyperbolic_tangent.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix: typo

* Apply suggestions from code review

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tianyi Zheng <[email protected]>