v5: Docs Utilities API updates (#29126)

Improvement to better understand how utilities class name are generated by the (_api.scss) base in the line of code below:
`$property-class: if($property-class, $property-class, nth($properties, 1));`

https://github.com/twbs/bootstrap/blob/fc02932946424e986a72bb7b47044eab815851cb/scss/mixins/_utilities.scss#L21

diff --git a/site/content/docs/4.3/utilities/api.md b/site/content/docs/4.3/utilities/api.md
index bfad9474403ba9dfea0aea3a335bd7dbf17eac19..470418bb887ef4a4cd361256086d29b18c1b44ed 100644 (file)
--- a/site/content/docs/4.3/utilities/api.md
+++ b/site/content/docs/4.3/utilities/api.md
@@ -13,7 +13,7 @@ The `$utilities` map contains all utilities and is later merged with your custom
 
 - `property`: Name of the property, this can be a string or an array of strings (needed for eg. horizontal paddings or margins).
 - `responsive` _(optional)_: Boolean indicating if responsive classes need to be generated. `false` by default.
-- `class` _(optional)_: Variable to change the class name if you don't want it to be the same as the property.
+- `class` _(optional)_: Variable to change the class name if you don't want it to be the same as the property. In case you don't provide the `class` key and `property` key is an array of strings, the class name will be the first element of the `property` array.
 - `values`: This can be a list of values or a map if you don't want the class name to be the same as the value. If null is used as map key, it isn't rendered.
 - `print` _(optional)_: Boolean indicating if print classes need to be generated. `false` by default.