Fix typos in website copy (#24)

Author: tpoulsen93

public/index.html

@@ -133,7 +133,7 @@ <h2>Easy to install!</h2>
             <section id="donate" class="container section text-center fade-in-up">
                 <h2>Enjoying MagicMirror? Consider a donation!</h2>
                 <p class="lead">MagicMirror² is open source and free. That doesn't mean we don't need any money.</p>
-                <p>Please consider a donation to help us cover the ongoing costs like webservers and email services.<br>If we receive enough donations we might even be able to free up some working hours and spend some extra time improving the MagicMirror² core.</p>
+                <p>Please consider a donation to help us cover ongoing costs like webservers and email services.<br>If we receive enough donations, we might even be able to free up some working hours and spend some extra time improving the MagicMirror² core.</p>
                 <div class="centered-content">
                     <a href="https://magicmirror.builders/paypal" class="btn btn-primary btn-lg">
                         <i class="fa-brands fa-fw fa-paypal" aria-hidden="true"></i> Donate using PayPal
@@ -143,7 +143,7 @@ <h2>Enjoying MagicMirror? Consider a donation!</h2>
 
             <section class="container section text-center fade-in-up">
                 <h3>Interested in developing your own modules?</h3>
-                <p>MagicMirror² has an extensively documented API. It allows you to built your own module backed by a powerful backend.<br>Check out the <a href="https://docs.magicmirror.builders/development/introduction.html" target="_blank">API documentation</a> for more information and start developing today.</p>
+                <p>MagicMirror² has an extensively documented API. It allows you to build your own modules backed by a powerful backend.<br>Check out the <a href="https://docs.magicmirror.builders/development/introduction.html" target="_blank">API documentation</a> for more information and start developing today.</p>
 
                 <h3>Interested in similar projects?</h3>
                 <p>