Update MathML documentation about the <ms> element (#21248)

files/en-us/web/mathml/element/ms/index.md

@@ -11,27 +11,41 @@ browser-compat: mathml.elements.ms
 
 {{MathMLRef}}
 
-The MathML `<ms>` element represents a _string literal_ meant to be interpreted by programming languages and computer algebra systems. By default, string literals are displayed as enclosed by double quotes (`&quot;`); by using the `lquote` and `rquote` attributes, you can set custom characters to display. Note that quotation marks should not be specified unless they are part of the string literal. The content of an `<ms>` element is not an ASCII string per se, but rather a sequence of characters and {{ MathMLElement("malignmark") }} elements.
+The MathML `<ms>` element represents a _string literal_ meant to be interpreted by programming languages and computer algebra systems.
 
 ## Attributes
 
 This element's attributes include the [global MathML attributes](/en-US/docs/Web/MathML/Global_attributes).
 
+Some browsers may also support the following deprecated attributes and will render the content of the `<ms>` element surrounded by the specified opening and closing quotes:
+
 - `lquote`
-  - : The opening quote character (depends on [`dir`](#attr-dir)) to enclose the content. The default value is "`&quot;".`
+  - : The opening quote to enclose the content. The default value is `&quot;`.
 
 - `rquote`
-  - : The closing quote mark (depends on [`dir`](#attr-dir)) to enclose the content. The default value is "`&quot;".`
+  - : The closing quote to enclose the content. The default value is `&quot;`.
 
 ## Examples
 
+### Default rendering
+
+```html
+<math display="block">
+  <ms>Hello World!</ms>
+</math>
+```
+
+{{ EmbedLiveSample('default_rendering', 700, 200, "", "") }}
+
+### Legacy quote attributes
+
 ```html
 <math display="block">
   <ms lquote="„" rquote="'">abc</ms>
 </math>
 ```
 
-{{ EmbedLiveSample('ms_example', 700, 200, "", "") }}
+{{ EmbedLiveSample('legacy_quote_attributes', 700, 200, "", "") }}
 
 ## Specifications