chores: fix typos in code and readme

[SethFalco]

Description

Checklist

• N/A New tests and/or benchmarks are included
• N/A Documentation is changed or added

Motivation and Context

• Mostly just fixes typos in the README that bothered me.
  • windows → Windows
  • Commmand → Command
  • MacOS → macOS
• Fixes a typo in the pull request template.
  • dependancy → dependency
• Removes a redundant line break in the README.
• Removes redundant assignment to connections, it's never used after that line anyway?
• СonnectionQuickPicks != ConnectionQuickPicks. I'm surprised the former is even a valid name in JavaScript. 🤔 It uses a Unicode character instead of an actual C.

I recommend you review the ConnectionQuickPicks yourself! 2 quick ways you can prove the difference though is:

1. CTRL + F and search one of them, and you'll find only one side of the diff will get highlighted.
2. If you do a comparison they won't match, or generate a hash from the two and it'll generate different results.

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[Anemy]

Nice catch on that С symbol. Not sure how that made it in. Starting to take a look at your prs now, thanks for the contributions!