[Fixes #5283] Adding some documentation for ResourceDefinition.SetVersion

It has to be a vallid SermVer format.

src/Orchard/UI/Resources/ResourceDefinition.cs

@@ -155,6 +155,10 @@ namespace Orchard.UI.Resources {
             return this;
         }
 
+        /// <summary>
+        /// Sets the version of the resource.
+        /// </summary>
+        /// <param name="version">The version to set, in the form of <code>major.minor[.build[.revision]]</code></param>
         public ResourceDefinition SetVersion(string version) {
             Version = version;
             return this;