Update securing-your-github-pages-site-with-https.md

[evK1]

Added note that Pages site must be public to obtain LE cert. Customer had an issue with this recently and it seems a fairly big oversight not to mention.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

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• [ ] I have reviewed my changes in staging, available via the View deployment link in this PR's timeline.

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• [ ] For content changes, I have completed the self-review checklist.

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Source	Preview	Production	What Changed
pages/getting-started-with-github-pages/securing-your-github-pages-site-with-https.md	fpt ghec	fpt ghec

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fpt: Free, Pro, Team ghec: GitHub Enterprise Cloud ghes: GitHub Enterprise Server ghae: GitHub AE

[cmwilson21]

👋 @evK1 - Thanks so much for opening a PR! I'll get this triaged for review :zap:

[evK1]

Left one suggestion to add a variable instead of the product name, but this change looks good to me. Thanks for adding this to our Docs!

Feel free to @mention me here to get this merged. ✨

@sophietheking - merge away ma'am :)

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