Need better documentation for PYDML function parameters

The various PyDML functions need improved documentation describing their functionality and the parameters that they take.

For example, the full() function in the PyDML Language Reference shows:
x = full(4, 4, 3)
But there's no description of what each parameter is. Additionally, the "Python syntax for DML" shows an example, but the parameters are in the wrong order. This can make it frustrating to write PyDML.

So right now issues like this can require someone to have to read source code to figure out the correct parameter syntax.