Update Help texts with FB links

Updated help text for Edit Ad Help

Facebook has strict editorial policies regarding punctuation, symbols, capitalization and other details related to the ad copy text. Please be aware of these policies before entering any ad copy customization.
Facebook ads with News Feed placement have 3 available fields for copy – the headline, body, and link description.

For more information on guidelines around ad copy usage, please refer https://www.facebook.com/policies/ads/

Updated help text for Social Ad Media Library Help.

User can choose an Image either from our stock Business Activity Image library or you can upload your own custom Image by selecting Merchant Library.
Recommended image size: 1,200 x 628 pixels
Image ratio: 1.91:1
To maximise ad delivery, use an image that contains little or no overlaid text. Facebook has strict editorial policies regarding imagery. Please be aware of these policies before entering any ad copy customization. Breach of these rules may lead to your ads being declined by Facebook.
For more information on guidelines around Image usage, please refer https://www.facebook.com/business/ads-guide/image#