Merge pull request rails#53315 from aidanharan/fix-rails-version-selector

Fix guides version selector

Author: rafaelfranca

guides/source/layout.html.erb

@@ -59,7 +59,7 @@
             <select class="guides-version">
               <option value="https://edgeguides.rubyonrails.org/"<%= " selected" if @edge %>>Edge</option>
               <% %w[7.2 7.1 7.0 6.1 6.0 5.2 5.1 5.0 4.2 4.1 4.0 3.2 3.1 3.0 2.3].each do |version| %>
-                <option value="https://guides.rubyonrails.org/v<%= version %>/"<%= " selected" if @version&.start_with?(version) %>><%= version %></option>
+                <option value="https://guides.rubyonrails.org/v<%= version %>/"<%= " selected" if @version&.start_with?("v#{version}") %>><%= version %></option>
               <% end %>
             </select>
           </span>