Replace incorrect example search term

[pwbriggs]

Why:

This tip box suggests methods for finding http (non-https) resources in the source code of a GitHub Pages site. However, the suggested search term, http, would match both http and https URIs.

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

Change http to http:// as the suggested search term—this will prevent https URIs being matched.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

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

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[Sharra-writes]

@pwbriggs Makes sense to me! Thanks for fixing it. I'll get this added to the merge queue once checks are passing.

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