v5: Drop remaining deprecated mixins (#28461)

- Deletes mixin mentions from float docs
- Deletes mixin mention from visibility docs
- Deletes the image-replacement page for text-hide

scss/utilities/_text.scss

@@ -56,10 +56,6 @@
 
 // Misc
 
-.text-hide {
-  @include text-hide($ignore-warning: true);
-}
-
 .text-decoration-none { text-decoration: none !important; }
 
 .text-break {