Fix page paths

Update PostListPageGenerator.swift

CHDataManagement/Generator/Post Lists/PostListPageGeneratorSource.swift

@@ -13,6 +13,9 @@ protocol PostListPageGeneratorSource {
 
     var pageDescription: String { get }
 
+    /**
+     The url to the page, including a leading slash
+     */
     func pageUrlPrefix(for language: ContentLanguage) -> String
 
     var postsPerPage: Int { get }