fix(docs): change alts of Brand logos for better a11y (#2709)

Co-authored-by: Louis-Maxime Piton <[email protected]>

site/content/docs/5.3/about/brand.md

@@ -20,15 +20,15 @@ Have a need for Boosted's brand resources? Great! We have only a few guidelines
   <div class="col">
     <div class="ratio ratio-1x1">
     <figure class="d-flex bg-black">
-      <img src="/docs/{{< param docs_version >}}/assets/brand/orange-logo.svg" class="figure-img img-fluid m-auto" width="220" height="220" role="img" alt="Orange" loading="lazy">
+      <img src="/docs/{{< param docs_version >}}/assets/brand/orange-logo.svg" class="figure-img img-fluid m-auto" width="220" height="220" role="img" alt="Orange master logo" loading="lazy">
       <figcaption class="figure-caption fw-bold position-absolute">Master logo</figcaption>
     </figure>
     </div>
   </div>
   <div class="col">
     <div class="ratio ratio-1x1">
     <figure class="d-flex bg-black">
-      <img src="/docs/{{< param docs_version >}}/assets/brand/orange-logo.svg" class="figure-img m-auto" width="30" height="30" role="img" alt="Orange" loading="lazy">
+      <img src="/docs/{{< param docs_version >}}/assets/brand/orange-logo.svg" class="figure-img m-auto" width="30" height="30" role="img" alt="Orange small logo" loading="lazy">
       <figcaption class="figure-caption fw-bold position-absolute">Small logo</figcaption>
     </figure>
     </div>
@@ -49,7 +49,7 @@ Orange Business Services has its own logo that contains the Orange logo and the
   <div class="col">
     <div class="ratio ratio-1x1">
     <figure class="d-flex bg-black">
-      <img src="/docs/{{< param docs_version >}}/assets/brand/OBS-logo.svg" class="figure-img img-fluid m-auto" width="220" height="220" role="img" alt="Orange" loading="lazy">
+      <img src="/docs/{{< param docs_version >}}/assets/brand/OBS-logo.svg" class="figure-img img-fluid m-auto" width="220" height="220" role="img" alt="Orange Business Services logo" loading="lazy">
       <figcaption class="figure-caption fw-bold position-absolute">Orange Business Services logo</figcaption>
     </figure>
     </div>