docs: improve readme [skip ci]

source/plugins/music/README.md

@@ -4,10 +4,10 @@ The *music* plugin lets you display :
 
 <table>
   <td align="center">
-    <details open><summary>🎼 Favorite tracks version</summary>
+    <details open><summary>Random tracks from a playlist</summary>
       <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.music.playlist.svg">
     </details>
-    <details open><summary>Recently listened version</summary>
+    <details open><summary>Recently listened</summary>
       <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.music.recent.svg">
     </details>
     <img width="900" height="1" alt="">