agilan11

fix(curriculum): updated the description to suggest that only the division operator must be used.

2

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fix(curriculum): improve syntax validation in steps 28 and 45 of BST lesson

3

Checklist: - [x] I have read and followed the [contribution guidelines](https://contribute.freecodecamp.org). - [x] I have read and followed the [how to open a pull request guide](https://contribute.freecodecamp.org/how-to-open-a-pull-request/). - [x] My pull...