Fix markdown formatting and remove typo in README

[Copilot]

Documentation audit identified malformed markdown links and stray text disrupting flow.

Changes

• Line 40: Fixed unclosed quote in "Creating, Cloning, and Archiving Repositories" link
• Line 58: Fixed unclosed quote in "About Project boards" link
• Line 61: Removed stray "asdf" text between Issues and Your user profile sections

Example

Before:

["Creating, Cloning, and Archiving Repositories](https://docs.github.com/...)

After:

["Creating, Cloning, and Archiving Repositories"](https://docs.github.com/...)

Original prompt

find improvements in my codebase

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