Minor typo and grammatical fixes in README.md and CONTRIBUTING.md

[solaasan]

Fixing typos and grammatical errors in README.md and CONTRIBUTING.md

Description

This PR fixes several typos and grammatical issues in the README.md file:

• Feature Parity: Corrected "feature parody" to "feature parity" to accurately describe matching features.
• Efficiency Comparison: Changed "then" to "than" for proper comparative grammar.
• Sentence Clarity: Removed an extra "is" to improve readability.
• Proper Noun Capitalization: Capitalized "Homebrew" as it is a proper noun.
• Subject-Verb Agreement: Adjusted "there are a plethora" to "there is a plethora" for correct grammatical agreement.

As well as three in the CONTRIBUTING.md file:

• Minor typo: Corrected "uou" to "you" under the Improving The Documentation section.
• Sentence Clarity: Changed“an particular style” to “a particular style” for proper grammatical usage under the Styleguides section.
• Broken Code of Conduct link fixed: Code of contact previously references the master branch which github does not find, this has been updated to the main branch's version of the file.

Motivation

Sorry I'm just one of those people who intrusively notices typos at times, fixing up some minor bits will help better present things on the main page of the repo and maintain professionalism.

Type of Change

• [x] Documentation update

Checklist

• [x] I have read the contribution guidelines and that 100% of my very minor changes are aligned with the legal notice.
• [x] I have verified that the documentation changes are accurate.
• [x] I have ensured that no other content was unintentionally modified.

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Let me know if there's anything else you'd like to add or adjust in the PR!