Fix the description of the cascade problem in the docs (#2659)

* Fix the description of the cascade problem in the docs

* Update docs/composition.mdx

Co-authored-by: Sam Magura <srmagura@gmail.com>

Co-authored-by: Sam Magura <srmagura@gmail.com>

docs/composition.mdx

@@ -27,7 +27,7 @@ render(
 
 With regular css, you can compose styles together using multiple class names, but this is very limited because the order that they're defined is the order they'll be applied. This can lead to hacks with `!important` and such to apply the correct styles.
 
-For example, we have some base styles and a danger style, we want the danger styles to have precedence over the base styles but because `base` is in the stylesheet after `danger` it has higher [specificity](https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity). In regular CSS, you might do something to make `danger` have a higher specificity than `base` like moving the `danger` class, so it's more specific than `base`, use `!important` or abandon composition and rewrite the styles each time you need them.
+For example, we have some base styles and a danger style, we want the danger styles to have precedence over the base styles but because `base` is in the stylesheet after `danger` its styles will override the styles defined in `danger`, as per [the cascade rules](https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Cascade_and_inheritance#the_cascade). In regular CSS, you might do something to make `danger` take precedence over `base` like moving the `danger` class so it's defined later than `base`, or use `!important`, or abandon composition and rewrite the styles each time you need them.
 
 ```jsx
 // @live
@@ -70,8 +70,8 @@ render(
   <div>
     <div css={base}>This will be turquoise</div>
     <div css={[danger, base]}>
-      This will be also be turquoise since the base styles
-      overwrite the danger styles.
+      This will be also be turquoise since the base styles overwrite the danger
+      styles.
     </div>
     <div css={[base, danger]}>This will be red</div>
   </div>