Fix built-in operators toc yml

[Rageking8]

Add missing [] in the subscript operator toc yml name and standardize the left and right shift operators title/name.

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

[learn-build-service-prod]

Learn Build status updates of commit 3add13e:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/cpp/left-shift-and-right-shift-operators-input-and-output.md	✅Succeeded
docs/cpp/subscript-operator.md	✅Succeeded
docs/cpp/toc.yml	✅Succeeded

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[prmerger-automator]

PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

[Jak-MS]

@TylerMSFT

• Can you review this PR?
• IMPORTANT: When this content is ready to merge, you must add #sign-off in a comment or the approval may get overlooked.

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

[TylerMSFT]

We don't need/want escape characters in the metadata description.

[learn-build-service-prod]

Learn Build status updates of commit 8308497:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/cpp/left-shift-and-right-shift-operators-input-and-output.md	✅Succeeded
docs/cpp/subscript-operator.md	✅Succeeded
docs/cpp/toc.yml	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[prmerger-automator]

PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

[learn-build-service-prod]

Learn Build status updates of commit 138cebb:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/cpp/left-shift-and-right-shift-operators-input-and-output.md	✅Succeeded
docs/cpp/subscript-operator.md	✅Succeeded
docs/cpp/toc.yml	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[TylerMSFT]

Thank you for making these consistent with the other topics.

[prmerger-automator]

PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

[learn-build-service-prod]

Learn Build status updates of commit ebaeea0:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/cpp/left-shift-and-right-shift-operators-input-and-output.md	✅Succeeded
docs/cpp/subscript-operator.md	✅Succeeded
docs/cpp/toc.yml	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[prmerger-automator]

PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

[TylerMSFT]

#sign-off