Update some http links to https

[Rageking8]

Prefer https links where possible.

[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 5f82740:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/code-quality/using-the-cpp-core-guidelines-checkers.md	✅Succeeded
docs/error-messages/compiler-errors-2/compiler-error-c3066.md	✅Succeeded
docs/overview/cpp-conformance-improvements-2017.md	✅Succeeded
docs/overview/what-s-new-for-visual-cpp-in-visual-studio.md	✅Succeeded

For more details, please refer to the build report.

[Copilot]

Pull Request Overview

This PR updates HTTP links to HTTPS where possible to improve security and follow best practices for web links in documentation.

Key changes:

• Updated three HTTP links to HTTPS equivalents
• Modified links in comments and documentation text

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
docs/overview/what-s-new-for-visual-cpp-in-visual-studio.md	Updated WG21 link from HTTP to HTTPS
docs/overview/cpp-conformance-improvements-2017.md	Updated open-std.org link from HTTP to HTTPS
docs/error-messages/compiler-errors-2/compiler-error-c3066.md	Updated open-std.org link from HTTP to HTTPS
docs/code-quality/using-the-cpp-core-guidelines-checkers.md	Updated NuGet package link from HTTP to HTTPS

[v-dirichards]

@TylerMSFT

Can you review the proposed changes?

Editorial changes LGTM

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

[TylerMSFT]

I feel more secure now :-)

[TylerMSFT]

#sign-off