correcting typo of homepage #547 (#549)

index.html

@@ -85,7 +85,7 @@ <h2 class="text-center customMargin1">Challenging and fun: It's hard fun!</h2>
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           <img id="imgrflt" src="{{ site.baseurl }}/assets/DSC06422.jpg" alt="Parent with smiling child, in front of a computer. The Music Blocks logo is visible as a sticker on the computer." width="100%">
-          <p><br>Learning isn't easy, but it should be fun. The Sugar Labs communinity works hard to make tools that are both challenging and fun. Hard fun is the <b>sweet spot!</b></p>
+          <p><br>Learning isn't easy, but it should be fun. The Sugar Labs community works hard to make tools that are both challenging and fun. Hard fun is the <b>sweet spot!</b></p>
         </div>
       </div>
     </div>