Update SSH Key Docs: clarify, restore, and improve SSH key generation and agent usage

[cyber-guide]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent

What part(s) of the article would you like to see updated?

1. Fix content errors:
   • Correct typo in "configuration's'" (extra apostrophe).
   • Restore truncated/missing content in several instruction steps.
2. Restore Troubleshooting information for Windows:
   • Reinstate section on troubleshooting SSH agent conflicts that was included in prior revisions.
3. Add ssh-add key timeout tip:
   • Document how to use ssh-add -t to configure key expiration in the agent.
4. Documentation clarity and accuracy:
   • Clarify when to use each key algorithm.
   • Make the documentation more actionable and beginner-friendly.
   • Address version inconsistencies if applicable.
5. General review for completeness and clarity.

Additional information

• Issues such as typos and missed steps can confuse new users.
• Restoring troubleshooting and timeout instructions supports better real-world workflows.
• Ensures platform-specific guidance is correct for Windows/macOS/Linux.
• Supports users' security and productivity by making key lifetime/timeout practices easy to follow.
• Screenshots or walkthrough GIFs would be valuable for visual learners.

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[mannyhill699-afk]

Help me understand all the codes