correct formatting on terraform secrets engine documentation

[kevin-loehfelm]

What

Correct formatting for HCP Terraform Secrets Engine. One of the paragraphs was incorrectly formatted as a shell-session

Why

A paragraph in step 3 of the Quick Start was incorrectly formatted as a shell-session

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Merge Checklist

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Pull Request

• Description links to related pull requests or issues, if any.

Content

• [N/A] You added redirects to content/terraform-docs-common/redirects.jsonc for moved, renamed, or deleted pages across all affected versions. Refer to Redirects for examples and guidance.
• [N/A] Links to related content where appropriate (e.g., CLI, language, API endpoints, permissions, etc.).
• [N/A] Pages with related content are updated and link to this content when appropriate.
• [N/A] Sidebar navigation files have been updated for added, deleted, reordered, or renamed pages.
• [N/A] New pages have metadata (page name and description) at the top.
• [N/A] New images are 2048 px wide. They have HashiCorp standard annotation color (#F92672) and format (rectangle with rounded corners), blurred sensitive details (e.g. credentials, usernames, user icons), and descriptive alt text in the markdown for accessibility.
• [N/A] New code blocks have the correct syntax and line breaks to eliminate horizontal scroll bars.
• [N/A] UI elements (button names, page names, etc.) are bolded.
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Reviews

• I or someone else reviewed the content for technical accuracy.
• I or someone else reviewed the content for typos, punctuation, spelling, and grammar.

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