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[python][docs] more detailed docs for trees_to_dataframe(), create_tree_digraph(), plot_tree() (#3618)

* [python] more detailed docs for trees_to_dataframe(), create_tree_digraph(), plot_tree()

* fixing warnings

* fix warnings

* undo unnecessary space

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* single line, better weight descriptions

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* column names

* Update python-package/lightgbm/plotting.py
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>