Fixed a typo in documentation

Author: mrin9

docs/index.html

@@ -124,7 +124,7 @@ <h2> Quickstart & Demo</h2>
   &lt;body&gt;
     &lt;rapi-pdf
       style = "width:700px; height:40px; font-size:18px;" 
-      spec-url = "https://mrin9.github.io/RapiPdf/examples/specs/petstore.json"
+      spec-url = "https://mrin9.github.io/RapiPdf/specs/petstore.json"
       button-bg = "#b44646" 
     &gt; &lt;/rapi-pdf&gt;
   &lt;/body&gt;