Correct typo in wording

Author: JBlond

README.md

@@ -25,7 +25,7 @@ composer require jblond/php-diff
 
 ## Example Use
 
-<details><summery>&nbsp;</summery><br>
+<details><summary>Example Code</summary><br>
 
 ```PHP
 <?php
@@ -68,7 +68,7 @@ echo $diff->Render($renderer);
 ### Example Output
 A quick usage example can be found in the `example/` directory and under example.php. Included is a light theme and a dark theme.
 
-<details><summery>Example Pictures</summery><br>
+<details><summary>Example Pictures</summary><br>
 
 #### HTML Side By Side Example
 ![HTML Side By Side Example](htmlSideBySide.png "HTML Side By Side Example")