Fix invalid <clear /> element in nuget.config example

[SurefireStudios]

Why:

Closes:

Remove access to public registries writes the NuGet clear element as < clear />, and XML element names cannot begin with whitespace.

So the example does not parse, and NuGet rejects the nuget.config the article is telling readers to write.

The correct <clear /> is already used twice in Working with the NuGet registry, and < clear /> appears nowhere else in content/.

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

Removed the stray space in all three occurrences — the xml block plus the two prose mentions, which are wrong the same way.

The block now parses:

root = configuration
  child: clear {}
  child: add {'key': 'example-nuget', 'value': 'https://private_registry_url/nuget/example-nuget/index.json'}

Same article as #45907 but non-overlapping lines, so either can merge first.

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
code-security/how-tos/secure-your-supply-chain/manage-your-dependency-security/remove-access-to-public-registries.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17

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

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[janiceilene]

👋 @SurefireStudios thanks for the PR! I'll get this triaged for review.

[mchammer01]

Nice catch! 🎯
I appreciate that you tracked down all three occurrences.
Thanks for contributing! LGTM ✅

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