Clean up basic_string class reference

[Rageking8]

• Convert "Class" in title to lowercase and rename "Parameters" heading with "Template parameters"
• Fix wrong return type in literals syntax and add missing comma in compare
• Add some backticks, fix some typos, and clean up redundant relative links

[prmerger-automator]

@Rageking8 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit a81ce6c:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/standard-library/basic-string-class.md	✅Succeeded

For more details, please refer to the build report.

[v-dirichards]

@TylerMSFT

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[Copilot]

Pull Request Overview

This PR cleans up the documentation for the basic_string class reference by making various editorial improvements and corrections. The changes focus on improving consistency, fixing typos, and ensuring proper formatting.

Key changes:

• Title case corrections and template parameter section renaming
• Fixed incorrect return types and missing punctuation in code documentation
• Formatting improvements with backticks and typo corrections

[TylerMSFT]

Thank you for all the cleanup in this topic.

[learn-build-service-prod]

Learn Build status updates of commit 3b3f65c:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/standard-library/basic-string-class.md	✅Succeeded

For more details, please refer to the build report.

[TylerMSFT]

#sign-off