Add `exceptions_json.log` description to docs

What does this MR do?

Related to #118808 (closed)

Include the description and example of exceptions_json.log into doc/administration/logs.md.

Does this MR meet the acceptance criteria?

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