Fixed typo in docs v5 (Utilities/API) page

Created by: MohammadxAli

Seems like there is a typo in : https://v5.getbootstrap.com/docs/5.0/utilities/api/

$utilities: (
  "opacity": (
    property: opacity,
    values: (
      0: 0,
      25: .25,
      50: .5, // This should be 75: .75
      100: 1,
    )
  )
 );

Since the generated class is :

.opacity-75 {
  opacity: .75;
}