Document bug in the Required Resource table


In the bellow table indices of [Required Resources table](https://github.com/IBM/ibm-licensing-operator/blob/latest/docs/Content/Preparing_for_installation.md#required-resources), there are 2 CPU Limit(m). 
I think the latter must be Memory Limit (Mi) .

Platform | CPU Request (m) | CPU Limit (m) | Memory Request (Mi) | CPU Limit (m)
-- | -- | -- | -- | --

