w3c error fixed

Author: TTiamiyu

Wireframe/index.html

@@ -20,15 +20,15 @@ <h2>Purpose of ReadME</h2>
         <a href="">Read more</a>
       </article>
       <article>
-        <img src="placeholder 2.png" alt="Wireframe image" />
+        <img src="placeholder2.png" alt="Wireframe image" />
         <h2>Purpose of Wireframe</h2>
         <p>
           Wireframe serves as a foundational blueprint or mental image of a product, it has numerous functions and most importantly wireframe is often used in the early stages of web or app development to prevent future, costly redesigns.
         </p>
         <a href="">Read more</a>
       </article>
       <article>
-        <img src="Branch.png" alt="" />
+        <img src="Branch.png" alt="Branch image" />
         <h2>What is a branch in Git</h2>
         <p>
           A branch represents an independent line of development in a Git repository, allowing multiple developers to work on different features or bug fixes simultaneously without affecting the main codebase until changes are ready to be merged.