Fix alerts

[akordowski]

Why:

There are occurrences of alerts without a header using the liquid and not the markdown notation.

Closes: #35445

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

This PR fixes the alerts by using the markdown notation.

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 a 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.

[github-actions]

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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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Content directory changes

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Source	Preview	Production	What Changed
actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/deploying-runner-scale-sets-with-actions-runner-controller.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
actions/writing-workflows/choosing-when-your-workflow-runs/triggering-a-workflow.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
admin/managing-iam/iam-configuration-reference/saml-configuration-reference.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
apps/creating-github-apps/authenticating-with-a-github-app/authenticating-as-a-github-app-installation.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
apps/github-marketplace/using-the-github-marketplace-api-in-your-app/handling-new-purchases-and-free-trials.md	fpt ghec	fpt ghec
apps/github-marketplace/using-the-github-marketplace-api-in-your-app/testing-your-app.md	fpt ghec	fpt ghec
apps/oauth-apps/building-oauth-apps/authenticating-to-the-rest-api-with-an-oauth-app.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
authentication/connecting-to-github-with-ssh/using-ssh-agent-forwarding.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
authentication/keeping-your-account-and-data-secure/about-anonymized-urls.md	fpt ghec	fpt ghec
authentication/keeping-your-account-and-data-secure/updating-your-github-access-credentials.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
authentication/managing-commit-signature-verification/telling-git-about-your-signing-key.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
authentication/troubleshooting-ssh/using-ssh-over-the-https-port.md	fpt ghec	fpt ghec
billing/managing-billing-for-your-products/managing-billing-for-github-packages/about-billing-for-github-packages.md	fpt ghec	fpt ghec
code-security/adopting-github-advanced-security-at-scale/introduction-to-adopting-github-advanced-security-at-scale.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/adopting-github-advanced-security-at-scale/phase-1-align-on-your-rollout-strategy-and-goals.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/adopting-github-advanced-security-at-scale/phase-2-preparing-to-enable-at-scale.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/adopting-github-advanced-security-at-scale/phase-3-pilot-programs.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/adopting-github-advanced-security-at-scale/phase-4-create-internal-documentation.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/adopting-github-advanced-security-at-scale/phase-5-rollout-and-scale-code-scanning.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/adopting-github-advanced-security-at-scale/phase-6-rollout-and-scale-secret-scanning.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/code-scanning/introduction-to-code-scanning/about-code-scanning-with-codeql.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/code-scanning/managing-code-scanning-alerts/tracking-code-scanning-alerts-in-issues-using-task-lists.md	fpt ghec	fpt ghec
code-security/codeql-cli/getting-started-with-the-codeql-cli/analyzing-your-code-with-codeql-queries.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
code-security/security-advisories/working-with-repository-security-advisories/adding-a-collaborator-to-a-repository-security-advisory.md	fpt ghec	fpt ghec
code-security/security-overview/filtering-alerts-in-security-overview.md	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
codespaces/getting-started/understanding-the-codespace-lifecycle.md	fpt ghec	fpt ghec
codespaces/setting-up-your-project-for-codespaces/configuring-dev-containers/adding-features-to-a-devcontainer-file.md	fpt ghec	fpt ghec
communities/maintaining-your-safety-on-github/blocking-a-user-from-your-personal-account.md	fpt ghec	fpt ghec
communities/using-templates-to-encourage-useful-issues-and-pull-requests/syntax-for-issue-forms.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
contributing/style-guide-and-content-model/style-guide.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
get-started/accessibility/github-command-palette.md	fpt ghec	fpt ghec
get-started/using-git/using-git-rebase-on-the-command-line.md	fpt ghec ghes@ 3.15 3.14 3.13 [3.12](https://docs-35468-433e6c.preview.ghdocs.com/enterprise-server@3.1...*[Comment body truncated]*