Fix capitalisation and specificity of parameters

Layout changes:
- randLoadIncrement makes references to previous 'load increment', so I put former after the latter.
- ( didn't add or remove information, just changed order). 
Content changes:
- Specified that probabilities and percentages range from 0 to 1. I think that the word "Percentage" is misleading since percentages range from 0 to 100, maybe it should be loadMaxProportion