Add documentation for params.node
Add documentation for params.node

I found out from angular-grid-angular-compiling/index.php example that params object exposes a node parameter that was not documented.
So this is a proposal to fix the documentation.
ceolter/ag-grid,Eurofunk/ag-grid,benoror/ag-grid,seanlandsman/ag-grid,ceolter/angular-grid,killyosaur/ag-grid,mtr/ag-grid,ua9msn/ag-grid,sasivarnan/ag-grid,S-YOU/ag-grid,ua9msn/ag-grid,ceolter/angular-grid,tbko/ag-grid,killyosaur/ag-grid,mtr/ag-grid,sasivarnan/ag-grid,killyosaur/ag-grid,matthewvasallo/angular-grid,seanlandsman/ag-grid,S-YOU/ag-grid,benoror/ag-grid,makinggoodsoftware/ag-grid,Eurofunk/ag-grid,ceolter/ag-grid,seanlandsman/ag-grid,tbko/ag-grid,makinggoodsoftware/ag-grid,matthewvasallo/angular-grid