Update fundamentals-1.md

[Tclack88]

change max to MAX (as it was the constant specified in the tutorial). If this was done intentionally to implicitly show that variable names are case-sensitive, then this is understandable, but it seems unintentional here.

Because

Reason: avoid any confusion for new programmers by staying consistant with the variable naming

This PR

• changed all occurences of max to MAX (2 occurences)

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[wise-king-sullyman]

Great catch, thanks!