Fixed typos in landing page (#41)

Author: atakangktepe

docs/index.html

@@ -107,7 +107,7 @@ <h2>Math Powered</h2>
                 </section>
                 <footer>
                     <h3>Conclusion</h3>
-                    <p>If you were disapointed with Vue.js, React, etc... If you want something super simple to build UI, just try DisplayJS! We hope you'll choose DisplayJS next time you do something great!</p>
+                    <p>If you were disappointed with Vue.js, React, etc... If you want something super simple to build UI, just try DisplayJS! We hope you'll choose DisplayJS next time you do something great!</p>
                 </footer>
             </article>
             <aside>
@@ -135,7 +135,7 @@ <h2>Simple</h2>
 
                       <img src="img/icon-feather.svg" alt="Feather icon">
                       <h2>Lightweight</h2>
-                      <p>Display is complitely optimized for modern browser and weight <span var="kb_polyfill">~ 15</span> kb minified (Polyfill) and weight only <span var="kb"></span> in its minified ES6 version! DisplayJS has multiple builds, to meet your expectations. And, I'm constantly optimizing DisplayJS, because size matters 😉!</p>
+                      <p>Display is completely optimized for modern browser and weight <span var="kb_polyfill">~ 15</span> kb minified (Polyfill) and weight only <span var="kb"></span> in its minified ES6 version! DisplayJS has multiple builds, to meet your expectations. And, I'm constantly optimizing DisplayJS, because size matters 😉!</p>
 
                     </div>
                     <div class="col col-4-of-12 col-m-4-of-4">