docs(quickstart): Fix spelling typos in QUICKSTART.md

[yashsinghal1234]

Description

There are a couple of spelling mistakes in the "Beginner Tips" section at the end of the QUICKSTART.md file. Fixing these will improve the documentation quality for new contributors.

Proposed Fix

Edit QUICKSTART.md to correct the spelling.

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[yashsinghal1234]

@Adez017 i would like to work on it

[yashsinghal1234]

"Hi! Could maintainer please label this issue as nsoc / nsoc-contribution and good first issue? Thank you!"