Fix link to Content Policies anchor

[mikehoffms]

Rendered article section for review: https://review.learn.microsoft.com/microsoft-edge/extensions-chromium/store-policies/developer-policies?branch=pr-en-us-2982#213-videos

• This PR removes 1 warning and 1 suggestion from all PRs in this repo, in full webpage build report.
• This PR makes link text match destination heading, per style guides. Important for navigation.
• Removes focus on "our/us/we"; keeps focus on the policies.
• Remove superfluous "then" that's usually omitted (style guide); streamlined for flow.

AB#48230843

[learn-build-service-prod[bot]]

Learn Build status updates of commit b16ddbc:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/extensions-chromium/store-policies/developer-policies.md	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

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