Edits to reflect RSA change

[Matt-UX]

Two headlines and one description will always be shown in the ad.

[opbld33]

Docs Build status updates of commit 18b5159:

:warning: Validation status: warnings

File	Status	Preview URL	Details
[]()	:warning:Warning		Details
Advertising/bingads-13/bulk-service/responsive-search-ad.md	:white_check_mark:Succeeded
Advertising/bingads-13/guides/responsive-search-ads.md	:white_check_mark:Succeeded

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