Update bing-web-search-single-page-app.md

[nacharya1]

updated links from Cog Services to Azure Portal

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

Learn Build status updates of commit 0e3349f:

:warning: Validation status: warnings

File	Status	Preview URL	Details
bing-docs/bing-web-search/tutorial/bing-web-search-single-page-app.md	:warning:Warning	View	Details

bing-docs/bing-web-search/tutorial/bing-web-search-single-page-app.md

• Line 2, Column 1: [Warning: ms-author-missing - See documentation] Missing required attribute: 'ms.author'. Add the current author's Microsoft alias.

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

Learn Build status updates of commit 5ddefd6:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
bing-docs/bing-web-search/tutorial/bing-web-search-single-page-app.md	:white_check_mark:Succeeded	View

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• Try searching the learn.microsoft.com contributor guides
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