Rearrange, make content more obvious (mdn#40771)

Update index.md

files/en-us/web/css/flex-basis/index.md

@@ -86,6 +86,9 @@ The `flex-basis` property is specified as either the keyword `content` or a `<'w
 
 ### Values
 
+- `content`
+  - : Indicates automatic sizing, based on the flex item's content.
+
 - `<'width'>`
   - : Any of the following units:
     - {{cssxref("&lt;length&gt;")}} sets an absolute value.
@@ -95,9 +98,6 @@ The `flex-basis` property is specified as either the keyword `content` or a `<'w
     - {{cssxref("min-content")}} sets the intrinsic minimum width.
     - {{cssxref("fit-content")}} sets the maximum possible size of a containing block's content area, bounded by the `min-content` and `max-content` values, and calculated based on the content of the current element.
 
-- `content`
-  - : Indicates automatic sizing, based on the flex item's content.
-
 ## Formal definition
 
 {{cssinfo}}