Removed an unnecessary example as well as changed the description for the usage of the 'await' keyword. Also added an example for async method declarations.
added some some time consuming code and a return to `CalcDamage`
removed `static` from `CalcTotalDamage` so that the compiler doesn't complain that `CalcDamage` should be static
compiler wasn't happy with `totalDamage += CalcDamage(player);` or `return await Task.WhenAll(totalDamage)` because you are attempting to assign a Task to an int. Fixed it by using `WhenAll` correctly
Changed parameter name of `CalcTotalDamage` from `group` to `people` as `group` can be confusing to read as its used with linq
