Fix typo in docs/Formula.md

docs/Formula.md

@@ -75,7 +75,7 @@ The formula is an expression with operators, operands and functions. Operands ca
 
 ### Reduce Functions
 - Reduce OR: reduce array X applying logical OR to each element ```OR(X)```
-- Reduce AND: reduce array X applying logical AND to each element ```OR(X)```
+- Reduce AND: reduce array X applying logical AND to each element ```AND(X)```
 
 # Attributes types