Added doctest to hash_map.py (#11105)

* Added doctest to heap.py

* Added doctest to hash_map.py

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

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

* Update hash_map.py

* Added doctest to hash_map.py

* Added doctest to hash_map.py

* Added doctest to detecting_english_programmatically.py

* Update detecting_english_programmatically.py

---------

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