Fix: add doctests and descriptive parameter for is_palindrome

[Mamtesh2001]

git commit --amend -m "Fix: add doctests and descriptive parameter for is_palindrome"

[algorithms-keeper]

Closing this pull request as invalid

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[Mamtesh2001]

git commit --amend -m "Fix: add doctests and descriptive parameter for is_palindrome"

[Mamtesh2001]

git commit --amend -m "Fix: add doctests and descriptive parameter for is_palindrome"

[Mamtesh2001]

"Fix: add doctests and descriptive parameter for is_palindrome"