Bug Report for valid-sudoku

[raffimohammed]

Bug Report for https://neetcode.io/problems/valid-sudoku

Please describe the bug below and include any steps to reproduce the bug or screenshots if possible.

Recommend better grammar to make the problem very clear right from the get go. The developer should not have to refer to the example to truly understand that a period can also be there. The current language gives the impression that all the digits 1-9 must exist in each row, column and sub-box which is not the case.

Each row can contain the digits 1-9 without duplicates and periods.
Each column can contain the digits 1-9 without duplicates and periods.
Each of the nine 3 x 3 sub-boxes of the grid can contain the digits 1-9 without duplicates and periods.