docs(video embed): remove intro sentence for each best practice

elements/rh-video-embed/docs/20-guidelines.md

@@ -60,8 +60,6 @@ The video’s width will dynamically adjust with its parent container. The video
 
 ### Play button
 
-Display the play button in a consistent, predictable spot for all videos.
-
 <div class="grid xs-two-columns">
   <uxdot-best-practice variant="do">
     <uxdot-example color-palette="lightest" width-adjustment="420px" slot="image">
@@ -87,8 +85,6 @@ Display the play button in a consistent, predictable spot for all videos.
 
 ### Aspect Ratio
 
-A video embed element and should have the same aspect ratio as the video it’s displaying.
-
 <div class="grid xs-two-columns">
   <uxdot-best-practice variant="do">
     <uxdot-example color-palette="lightest" width-adjustment="420px" slot="image">