Fix link in synopsys

Author: pmai

content/_index.html

@@ -36,7 +36,7 @@
             <div class="ma-logo ssp-logo masthead-logo d-none d-sm-block mx-auto mt-5 mb-5" style="height: 180px"></div>
 
             <p class="lead mb-4">
-                System Structure and Parameterization (SSP) is a tool independent standard to define complete systems consisting of one or more component models, including [FMUs](https://fmi-standard.org/) and their parameterization that can be transferred between simulation tools.
+                System Structure and Parameterization (SSP) is a tool independent standard to define complete systems consisting of one or more component models, including <a href="https://fmi-standard.org/">FMUs</a> and their parameterization that can be transferred between simulation tools.
             </p>