fix: readme print X and y for generate_data_lr

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (16038c8) 100.00% compared to head (52727f9) 100.00%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #73 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 4 4 Lines 70 70 ========================================= Hits 70 70 ```

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[Jing-19]

looks to good. Thanks!