Two typos: Alberta Einstein and Categorical

[engramrod]

On the ExcelNumericalDemos, there are two typos:

1. Alberta Einstein instead of Albert Einstein, see: https://github.com/GeostatsGuy/ExcelNumericalDemos
2. Cateogrical Indicator Kriging Demo instead of Categorical, see: 565bf81

PS: Thank you very much for sharing all of your knowledge, explanations, demos, code and everything for everyone!