update docs from change in quarto-cli#7044

docs/prerelease/1.4/crossref.qmd

@@ -26,7 +26,7 @@ The changes to cross-references in Quarto 1.4 also introduce some changes to the
     <div aria-describedby="fig-1-caption-0ceaefa1-69ba-4598-a22c-09a6ac19f8ca">
       <img src="./img/content.jpg">
     </div>
-    <figcaption id="fig-1-caption-0ceaefa1-69ba-4598-a22c-09a6ac19f8ca" class="figure quarto-float-caption quarto-float-fig">
+    <figcaption id="fig-1-caption-0ceaefa1-69ba-4598-a22c-09a6ac19f8ca" class="quarto-float-caption quarto-float-fig">
     Figure&nbsp;1: This is a caption.
     </figcaption>
     </figure>
@@ -38,7 +38,7 @@ The changes to cross-references in Quarto 1.4 also introduce some changes to the
   - All cross-referenceable elements use the `figure` HTML element with class `quarto-float`.
   - Different float types are differentiated by the CSS class `quarto-float-fig` (or `-tbl`, `-lst`, or the `ref_type` of custom cross-reference types) as well as the additional CSS class `figure`, `table`, etc. 
     If the element is a subfloat, this will be `quarto-subfloat-fig`.
-  - Similarly, float captions use the `figcaption` element with class `quarto-float-caption` (or `quarto-subfloat-caption` if they're a subfloat), and are differentiated by the same additional CSS classes.
+  - Similarly, float captions use the `figcaption` element with class `quarto-float-caption` (or `quarto-subfloat-caption` if they're a subfloat), and also have the `quarto-float-*` CSS classes.
 
   This setup lets all "floats" be uniformly targeted by a single CSS rule, as well as allowing specific float types and their captions be targeted by a single additional CSS selector.