Update README.md

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

Author: FabianaCampanari

README.md

@@ -1335,7 +1335,7 @@ The initial solution obtained via the Northwest Corner Method has a total cost o
 
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-### Step 1: [Optimality Check Using Multipliers]()
+### [Step 1](): Optimality Check Using Multipliers
 
 ### - [**Multipliers calculation**]():