Update index.html

Author: joanne342

Wireframe/index.html

@@ -14,7 +14,7 @@ <h1>Readme, branch and wireframe</h1>
     <main>
       <!-- Featured Article -->
       <article>
-        <img src="https://docs.github.com/assets/cb-2058/mw-1440/images/help/branches/pr-retargeting-diagram1.webp" alt="Branch image" />
+        <img src="https://docs.github.com/assets/cb-2058/mw-1440/images/help/branches/pr-retargeting-diagram1.webp" alt="A Git branching diagram showing 'feature2' merging into 'feature1', and 'feature1' merging into 'main'." />
         <h2>Branch</h2>
         <p>A branch is basically a pointer to a snapshot of your code so you can experiment with it without affecting the main codebase. It isn't a full copy because repos with multiple branches could get huge. Then you can merge your changes to the main codebase. It's like a sandbox.</p>
         <a href="https://en.wikipedia.org/wiki/Branching_(version_control)">Read More</a>