Fix typos in release notes

all/src/main/templates/release-notes.html

@@ -84,7 +84,7 @@
 
         <ul>
             <li><tt>ComboBox</tt> has a better new item handling implementation with <tt>NewItemProvider</tt>.</li>
-            <lli><tt>Binding</tt> APIs have been improved to allow more advanced use.</lli>
+            <li><tt>Binding</tt> APIs have been improved to allow more advanced use.</li>
             <li>New <tt>ReadOnlyHasValue</tt> wrapper class for easy implementation of new <tt>HasValue</tt>s for <tt>Binder</tt>.</li>
             <li>Built-in <tt>StringTo</tt> converters now have option to use <tt>ErrorMessageProvider</tt>.</li>
             <li><tt>Grid</tt> headers and footers now support tooltips.</li>
@@ -106,7 +106,7 @@
         <li><tt>BrowserWindowOpenerConnector</tt> and <tt>FileDownloaderConnector</tt> now are subclasses of <tt>AbstractEventTriggerExtensionConnector</tt>
         <li>Date range limits in <tt>AbstractDateFieldState</tt> are now <tt>String</tt>s instead of <tt>Date</tt>s, some client-side method signatures were changed</li>
         <li><tt>BrowserResizeListener</tt> is only called once resizing ends.</li>
-        <li><tt>ItemClickEvent</tt> for <tt>Grid</tt> now takes and additional row index parameter.</li>
+        <li><tt>ItemClickEvent</tt> for <tt>Grid</tt> now takes an additional row index parameter.</li>
 
         <h2>For incompatible or behavior-altering changes in 8.3, please see <a href="https://vaadin.com/download/release/8.3/8.3.0/release-notes.html#incompatible">8.3 release notes</a></h2>