Change doc meta content to V2 sdk

Author: mullermp

doc-src/templates/default/layout/html/layout.erb

@@ -4,7 +4,7 @@
     <%= erb(:headers) %>
     <!-- Docs Metrics + Cookie Consent Script -->
     <meta name="guide-name" content="API Reference">
-    <meta name="service-name" content="AWS SDK For Ruby V3">
+    <meta name="service-name" content="AWS SDK For Ruby V2">
     <script type="text/javascript" src="/assets/js/awsdocs-boot.js"></script>
     <!-- Gitter chat -->
     <script>((window.gitter = {}).chat = {}).options = { room: 'aws/aws-sdk-ruby' };</script>