Docs: fixup `maintainers` derivation meta field example

Dependencies

• [2] HBZEBIYZ Docs: document derivation attributes

Change contents

• replacement in doc/manual/src/jobs.md at line 17
  [2.647]→[2.647:858](∅→∅)
  − * `maintainers` - a comma separated list of maintainer email addresses from `meta.maintainers`, expected to be a list of attribute sets with an attribute named `email`, ex: `[ { email = "alice@example.com"} ]`.
  [2.647]

  [2.858]
  + * `maintainers` - a comma separated list of maintainer email addresses from `meta.maintainers`, expected to be a list of attribute sets with an attribute named `email`, ex: `[ { email = "alice@example.com"; } ]`.