Fix syntactic issues in EDoc comments across some libs

* siri/logger-fix:
  Change logger callback removing_handler/1 to removing_handler/2
  Don't crash logger_server due to unexpected message
  Add logger:update_process_metadata/1
  Improve documentation of logger:set_*_config functions
  Change return type from logger_formatter:format/2
  Improve test of logger_disk_log_h and logger_std_h
  Update logger documentation
  Set single_line=true by default in logger_formatter

This used to be string() is now changed to unicode:chardata().

See https://github.com/erszcz/docsh/issues/23 for an explanation
about how the files were found.

* john/kernel/add-file_int-to-release:
  Add file_int.hrl to release target