Fix typo in documentation

Author: btwael

documentation/index.html

@@ -99,7 +99,7 @@ <h1 class="content-subhead">Table of contents</h1>
                 <h1 class="content-subhead" id="c-contri">Contribute and support</h1>
                 <p>You have any feature idea, a bug to correct or an improvement, feel free to <a href="https://github.com/btwael/SuperString/issues">open a issue</a> or <a href="https://github.com/btwael/SuperString/pulls">send your pull request</a>.</p>
 
-                <p>You can also support the author of SubString via <a href="https://www.patreon.com/btwael">Patreon</a> or <a href="https://www.paypal.me/btwael">Paypal</a>.</p>
+                <p>You can also support the author of SuperString via <a href="https://www.patreon.com/btwael">Patreon</a> or <a href="https://www.paypal.me/btwael">Paypal</a>.</p>
 
                 <!-- Install -->
                 <h1 class="content-subhead" id="c-install">Install and use</h1>