Add docstrings and doctests and fix a bug ciphers/trifid_cipher.py (#10716)

* Added docstrings,doctests and fixed a bug

* Added docstrings,doctests and fixed a bug

* Added docstrings,doctests and fixed a bug

* Added docstrings and doctests with a bug fix

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* Added docstrings and doctests with a bug fix

* Update ciphers/trifid_cipher.py

Co-authored-by: Christian Clauss <[email protected]>

* Update ciphers/trifid_cipher.py

Co-authored-by: Christian Clauss <[email protected]>

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

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* Docstrings edit

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* Update trifid_cipher.py

* Update pyproject.toml

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