Construction resource documentation needs updating for CostRatesConsumed

https://forums.buildingsmart.org/t/construction-resource-documentation-needs-updating/3644/6

The following documentation is oudated. `CostRatesConsumed` is now `Usage`.

> For time series properties as shown in Figure 180, each [IfcTimeSeriesValue](http://localhost:8001/schema/ifcdatetimeresource/lexical/ifctimeseriesvalue.htm) indicates a LIST of values, where the sequence of the value corresponds to the [IfcCostValue](http://localhost:8001/schema/ifccostresource/lexical/ifccostvalue.htm) at *IfcConstructionResource.CostRatesConsumed* . For example, if *CostRatesConsumed* has two [IfcCostValue](http://localhost:8001/schema/ifccostresource/lexical/ifccostvalue.htm) items in the LIST, "Standard" and "Overtime", then *IfcTimeSeriesValue(IfcDuration('T8H0M0S'),IfcDuration('T2H0M0S'))* would indicate 8 hours at Standard rate and 2 hours at Overtime rate. If the list of values at *IfcTimeSeriesValue.ListValues* is less than the size of *CostRatesConsumed* , then subsequent values are considered to be zero.

Actually, bumping this topic since I messed up when writing this - I no longer think that `CostRatesConsumed` is now `Usage`. Perhaps it _may_ be `BaseCosts`, but it's all a bit vague and confusing and I cannot find any reference to it in the schema at all.

In other words, the paragraph makes little sense and needs to be reviewed.