Issue #3513125 by mabho: Use singular in field formatter label

Marcos Hollandarequested to merge
issue/social_link_field-3513125:3513125-update-field-formatter-label into 8.x-1.x

Issue #3513125 mabho: Use singular Font Awesome icon instead of plural Font Awesome icons in class SocialLinkFontAwesomeFormatter documentation.

Closes #3513125

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