[Feature Request] Allow searching document links by document ID

Description

Document link custom fields currently appear to search documents by title,
but not by the internal document ID.

When many documents have the same title, selecting the correct document is
difficult. Please include the document ID in the autocomplete/search fields
for custom fields of type "Document link", ideally displaying it together
with the title.

Example:
Invoice (ID: 1234)
Invoice (ID: 5678)


Other

_No response_