card.md: use text-dark for warning card.

Author: XhmikosR

site/content/docs/4.3/components/card.md

@@ -409,7 +409,7 @@ Use [text and background utilities]({{< docsref "/utilities/colors" >}}) to chan
 {{< example >}}
 {{< card.inline >}}
 {{- range (index $.Site.Data "theme-colors") }}
-<div class="card{{ if not (eq .name "light") }} text-white{{ end }} bg-{{ .name }} mb-3" style="max-width: 18rem;">
+<div class="card{{ if not (or (eq .name "light") (eq .name "warning")) }} text-white{{ end }} bg-{{ .name }} mb-3" style="max-width: 18rem;">
   <div class="card-header">Header</div>
   <div class="card-body">
     <h5 class="card-title">{{ .name | title }} card title</h5>