Update sameAs field description to mention comma-separated URLs

Problem/Motivation

The current description of the sameAs field in the Schema.org Metatag module reads:

"Url linked to the web site, such as wikipedia page or social profiles."

This description is ambiguous for cases where multiple URLs need to be provided. To ensure users understand that this field supports multiple URLs in a comma-separated format, the description should be updated.

Steps to reproduce

1. Navigate to the Schema.org Metatag configuration.
2. Observe the current description for the sameAs field.

Proposed resolution

Update the field description to:

"A comma-separated list of URLs linked to the web site, such as Wikipedia pages or social profiles."