Improve wording in Git setup Next steps section

[Harinee12]

Improves clarity and wording in the Next steps section without changing meaning.

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Table of review links

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Source	Review	Production	What Changed
get-started/git-basics/set-up-git.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[watcharen101]

ปรับปรุงความชัดเจนและถ้อยคำในส่วน "ขั้นตอนต่อไป" โดยไม่เปลี่ยนแปลงความหมาย