fix: simplify command syntax for building a todo API in getting started guide

Author: jongio

web/src/pages/getting-started.astro

@@ -123,7 +123,7 @@ import TerminalCode from '../components/TerminalCode.astro';
 
           <div class="substep">
             <h3>Or build directly from a description</h3>
-            <TerminalCode code='azd copilot build --description "A todo API with PostgreSQL on Azure Container Apps"' />
+            <TerminalCode code='azd copilot build "A todo API with PostgreSQL on Azure Container Apps"' />
           </div>
 
           <div class="substep">