Add Doc test bubble sort (#12070)

* The string manipulation - replace()

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

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* Update replace.py

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* updating DIRECTORY.md

* Add doc test to bubble_sort

* Update DIRECTORY.md

* Delete strings/replace.py

* Update bubble_sort.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: vijayalaxmi777 <[email protected]>
Co-authored-by: Maxim Smolskiy <[email protected]>