Merge branch 'rs-fix-deployments-v3-namespace' into 'master'

Move `api/v3/deployments` to the correct namespace

See merge request !9732

lib/api/deployments.rb

 module API
-  # Deployments RESTfull API endpoints
+  # Deployments RESTful API endpoints
   class Deployments < Grape::API
     include PaginationParams
 

lib/api/v3/deployments.rb

 module API
-  # Deployments RESTfull API endpoints
+  module V3
+    # Deployments RESTful API endpoints
     class Deployments < Grape::API
       include PaginationParams
 
@@ -38,4 +39,5 @@ module API
         end
       end
     end
+  end
 end