Fix typo in GitHub link (#276)

Signed-off-by: Mukilan Thiyagarajan <[email protected]>

Author: mukilan

_includes/sponsorship.html

@@ -95,7 +95,7 @@ <h3 class="center-text">Bronze Sponsors</h3>
 
 <div class="acknowledgements">
     <div class="acknowledgements__container">
-        <p>We would like to thank <a href="https ://github.com/">GitHub</a>, <a href="https://zulip.com/">Zulip</a>, and <a href="https://aws.amazon.com/opensource/">AWS Open Source</a> for <a href="{{ '/sponsorship/#infrastructure-sponsors' | url }}">their services</a> free of charge for use in the Servo project.</p>
+        <p>We would like to thank <a href="https://github.com/">GitHub</a>, <a href="https://zulip.com/">Zulip</a>, and <a href="https://aws.amazon.com/opensource/">AWS Open Source</a> for <a href="{{ '/sponsorship/#infrastructure-sponsors' | url }}">their services</a> free of charge for use in the Servo project.</p>
         <p>For information about how to sponsor the project, visit <a href="{{ '/sponsorship/' | url }}">the sponsorship page</a>.</p>
       </div>
 </div>
@@ -161,4 +161,4 @@ <h3 class="center-text">Bronze Sponsors</h3>
 }
 
 
-</style>
+</style>