Update documentation

Author: lowlighter

source/plugins/introduction/README.md

@@ -5,10 +5,10 @@ It is mostly intended for metrics used outside of GitHub, since these informatio
 
 <table>
   <td align="center">
-    <details><summary open>Account version</summary>
+    <details open><summary>Account version</summary>
       <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.introduction.svg">
     </details>
-    <details><summary open>Repository version</summary>
+    <details open><summary>Repository version</summary>
       <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.introduction.repository.svg">
     </details>
     <img width="900" height="1" alt="">

source/plugins/languages/README.md

@@ -5,7 +5,7 @@ The *languages* plugin displays which programming languages you use the most acr
 <table>
   <td align="center">
     <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.languages.svg">
-    <details><summary>With both total bytes size and percentage version</summary>
+    <details open><summary>With both total bytes size and percentage version</summary>
       <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.languages.details.svg">
     </details>
     <img width="900" height="1" alt="">