DEVDOCS-6185 - Update endpoint to include file size limit

[bc-terra]

DEVDOCS-6185

What changed?

• The Create Favicon Image endpoint has a file size limit that was not previously documented
• Files larger than 10 MB will return a 422

Release notes draft

• Updated doc to include reference to file size limit
• Added 422 to the responses list

Anything else?

ping {names}