Update why-is-git-always-asking-for-my-password.md

[dedale]

Why:

When working on Windows with git in a cmd (not git bash), you need to use git@github urls (not https://github) to ensure that git only ask for passphrase (not login/password everytime).

Closes [issue link]

What's being changed:

Add a sentence to advise user about updating remote url.

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• I have reviewed my changes in staging. (look for the deploy-to-heroku link in your pull request, then click View deployment)
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[janiceilene]

@dedale Thanks so much for opening a PR! I'll get this triaged for review ✨

[myarb]

👋🏼 Thanks for the contribution! The information you've added here is covered in the article linked in the Further Reading section, so we're going to close this one out. We appreciate your passion for improving and contributing to the GitHub Docs 💖