docs: correct typo and fix phrasing in docs

[waveofmymind]

Motivation

I found a typo and awkward phrasing in docs.

Modifications

• Correct typo in the word.
• Fix pharsing in the sentence.

Commit Convention Rule

• Please commit your modification based by conventional commit:

Commit type	Description
feat	New Feature
fix	Fix bug
docs	Documentation only changed
ci	Change CI configuration
refactor	Not a bug fix or add feature, just refactoring code
test	Add Test case or fix wrong test case
style	Only change the code style(ex. white-space, formatting)
chore	It refers to minor tasks such as library version upgrade, typo correction, etc.

• If you want to add some more commit type please describe it on the Pull Request

Result

• It doesn't affect others.

Closes

• #{issue number} (If this PR resolves an issue.)

[shouwn]

제가 한국어 Document에 신경을 많이 못 썼네요. 😢 확인해주셔서 감사합니다!