add description for readmore (#8329)

Author: lyndaidaii

src/NuGetGallery/Views/Packages/_VerifyMetadata.cshtml

@@ -75,7 +75,7 @@
                                                     <!-- /ko -->
                                                 </ul>
                                                 We recommend that you fix these issues and upload a new package.
-                                                <a href="https://docs.microsoft.com/en-us/nuget/policies/nuget-faq#managing-packages-on-nugetorg" alt="Read more">Read more</a><br />
+                                                <a href="https://docs.microsoft.com/en-us/nuget/policies/nuget-faq#managing-packages-on-nugetorg" alt="Read more" aria-label="Read more about managing packages on nuget.org">Read more</a><br />
                                             </span>)
             <!-- /ko -->