Update Economic_Tutorial.md

Tutorials/Economic_Tutorial.md

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 ## 1. Introduction 
 Welcome to our comprehensive tutorial on running economic models. The economic model (`economic_f.py`) can be used to perform economic assessments of the treatment train or of individual units to identify economic hotspots. The economic assessment will help researchers, engineers, and decision-makers improve the system's performance and select the most economically feasible integration of technologies. 
 
-In this tutorial, we provide step-by-step instructions on how to [use economic models](#calculate-capital-costs-capex) and [analyse the results](#results-evaluation) obtained using **Example 1** as case study (see **Figure 1**).  
+In this tutorial, we provide step-by-step instructions on how to [use economic models](#calculate-capital-costs-(-capex-)) and [analyse the results](#results-evaluation) obtained using **Example 1** as case study (see **Figure 1**).  
 
 <figure>
   <img src="https://github.com/rodoulak/Desalination-and-Brine-Treatment-Simulation-/assets/150446818/55cc6b6f-dde8-4b12-ae61-fa23665c288e" alt="Image" style="width:600px;">