[DOCS] editable__columnname is not documented

[AlexandreSajus]

Issue Description

The proper syntax to make the "Demand" column of a table editable in tgb is:

tgb.table("{demand_table}", on_edit=edit_demand, editable__Demand=True)

But this syntax is not documented in the docs:
https://docs.taipy.io/en/develop/manuals/userman/gui/viselements/generic/table/
https://docs.taipy.io/en/develop/tutorials/visuals/2_using_tables/

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[FabienLelaquais]

The title of this issue should be something like "Index properties are not documented in the Page Builder API".

The thing is... we have no satisfactory response just yet. The syntax you mention does work, but may not in the future.
The reason is that column names (or datasets, in the case of charts) may to be valid Python indentifiers.
Anyway... that is relevant. Thanks.