Update README.md

Signed-off-by: Fabiana  🧬 Campanari <113218619+FabianaCampanari@users.noreply.github.com>

Author: FabianaCampanari

README.md

@@ -333,7 +333,7 @@ The **graphical method** for solving simple linear programming (LP) problems inv
 
 ### [Key]() Concepts:
 
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 - **[Decision Variables]():** These are the variables that we want to determine the values of to optimize the ***[OBJECTIVE FUNCTION]()*** (e.g.):