docs(video-embed): update play button usage information

elements/rh-video-embed/docs/10-style.md

@@ -22,7 +22,7 @@ The video embed element consists of a semitransparent play button with a video t
 
 ## Theme
 
-The video embed element is available in both light and dark themes. It can include either a light or a dark play button, depending on the thumbnail image underneath. If an image is lighter, use a dark play button for accessibility and vice versa.
+The video embed element is available in both light and dark themes. It can include either a light or a dark play button, depending on the thumbnail image underneath. If an image is lighter, use a dark play button for accessibility and vice versa. The user is currently responsible for setting the play button color and preventing color contrast issues between the button and the video thumbnail.
 
 <div class="grid xs-two-columns">
   <uxdot-example width-adjustment="420px">

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">