Fix typos

[sdwheeler]

PR Summary

Fix typos

• Fixes AB#548067

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

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[learn-build-service-prod]

Learn Build status updates of commit 3883c6e:

✅ Validation status: passed

File	Status	Preview URL	Details
.markdownlint.yaml	✅Succeeded
README.md	✅Succeeded

For more details, please refer to the build report.

[Copilot]

Pull request overview

This pull request fixes typos and updates outdated terminology in documentation files. The changes correct spelling errors and update an extension name to its current designation.

Changes:

• Corrected two instances of "Superceded" to the proper spelling "Superseded" in markdownlint configuration comments
• Updated the VS Code extension name from "Remote - Containers" to "Dev Containers" to reflect the current official name

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
README.md	Updated VS Code extension name from "Remote - Containers" to "Dev Containers"
.markdownlint.yaml	Fixed two spelling errors: "Superceded" → "Superseded"

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