Fix/combine adjacent (#1426)
* Fix combine_adjacent arg of HighlightedText
* Delete multilingual_named_entity_recognition_using_mbert.md
* Fix file components.py style
* Fix style gradio/components.py
* Add adjacent_separator parameter to HighlightedText class
Co-authored-by: martina.fumanelli <martina.fumanelli@MBP-di-martinafumanelli.local>
Co-authored-by: martina.fumanelli <martina.fumanelli@MBPdimaumanelli.homenet.telecomitalia.it>
