fix typo in quick start

Author: mpictor

index.html

@@ -68,7 +68,7 @@ <h3>Get up and running <em>in&nbsp;seconds</em>.</h3>
         <p class="line">
           <span class="path">~</span>
           <span class="prompt">$</span>
-          <span class="command">cmake .. -DSC_BUID_SCHEMAS=ap214</span>
+          <span class="command">cmake .. -DSC_BUILD_SCHEMAS=ap214</span>
         </p>
         <p class="line">
           <span class="path">~</span>