Add comment on writable for webdav file source

  # By default, the plugin will use temp files to avoid loading entire files into memory. 

  # You can change the directory here or omit to use the default temp directory.

  temp_path: /your/temp/path

  # Set writable to true if you have write access to this source

  # and want to allow exporting files to it, by default is read only.

  writable: false

- type: posix

  root: '/data/5/galaxy_import/galaxy_user_data/covid-19/data/sequences/'