call: update donation text

_includes/call-to-action.html

@@ -6,7 +6,7 @@
 
       <div class="col-lg-8 text-center">
         <h3><span class="fa fa-heart fa-lg main-list-item-icon"></span> Make a Donation <span class="fa-brands fa-paypal fa-md main-list-item-icon"></span></h3>
-        <p>If you find any value and usefulness in the resources of this site, please consider making&mdash;via paypal&mdash;a one-time donation in any amount.<br> Your support really matters.</p>
+        <p>If you find any value and usefulness in the resources of this site, please consider making&mdash;via paypal&mdash;a one-time donation in any amount (e.g. the amount you would spend inviting me a cup of coffee or any other drink).<br> Your support really matters.</p>
 
         <form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_blank">
         <input type="hidden" name="cmd" value="_donations" />