Attribute third-party brand assets in the license

What does this MR do?

• Update “third party” to “third-party”.
• Add a line that attributes third-party brand assets to their respective license holders.

This is useful for when company logos (or other brand assets) are used to represent integrations or other relationships in the software. This specifically calls out brand assets separately from third-party components to also mention that the use of such assets is only to represent the brand or service that owns the license.

Conformity

• Changelog entry
• [-] Documentation (if required)
• [-] Code review guidelines
• [-] Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

N/A

Security

N/A

/cc @tauriedavis @lasayers