style:fix the typo in number.go

[Mike666666-max]

What problem does this PR solve?

Correct the spelling in number.go

Checklist:

• [√ ] My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Mike666666-max]

@shilinlee PTAL There is no similiar problems so far. Please see and check it.