Justify type and justify function under different headings

[ExcaliburZero]

The Justify data type and the justify function are currently under two different headings in the library documentation. Currently, Justify is under "Table", while justify is under "Attributes".

Since the function relies on the data type, the two should probably be put under the same heading.

It would probably be best to move Justify to "Attributes", as it is not used solely for tables.